Allow UlidFactory.java to accept a LongSupplier as a time source
Using a `java.time.Clock` to get the current time as milliseconds from epoch is inconvenient, as `java.time.Clock` is an abstract class requiring 3 methods to be implemented, which makes interoperability with other JVM languages e.g. Kotlin hard. By exposing overloaded factory methods that accept a LongSupplier, this problem disappears without breaking backward compatibility.
This commit is contained in:
Michele Sollecito
GitHub
parent
a5006743ed
commit
3ecd6c84a1
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@ -49,356 +49,401 @@ import java.util.function.LongSupplier;
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*/
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public final class UlidFactory {
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private final Clock clock; // for tests
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private final LongFunction<Ulid> ulidFunction;
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private final LongSupplier timeMillisNow; // for tests
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private final LongFunction<Ulid> ulidFunction;
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// ******************************
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// Constructors
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// ******************************
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// ******************************
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// Constructors
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// ******************************
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/**
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* Default constructor.
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*/
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public UlidFactory() {
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this(new UlidFunction(IRandom.newInstance()));
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}
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/**
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* Default constructor.
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*/
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public UlidFactory() {
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this(new UlidFunction(IRandom.newInstance()));
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}
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private UlidFactory(LongFunction<Ulid> ulidFunction) {
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this(ulidFunction, null);
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}
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private UlidFactory(LongFunction<Ulid> ulidFunction) {
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this(ulidFunction, (LongSupplier) null);
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}
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private UlidFactory(LongFunction<Ulid> ulidFunction, Clock clock) {
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this.ulidFunction = ulidFunction;
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this.clock = clock != null ? clock : Clock.systemUTC();
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}
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private UlidFactory(LongFunction<Ulid> ulidFunction, Clock clock) {
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this(ulidFunction, clock != null ? clock::millis : null);
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}
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/**
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* Returns a new factory.
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* <p>
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* It is equivalent to {@code new UlidFactory()}.
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*
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance() {
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return new UlidFactory(new UlidFunction(IRandom.newInstance()));
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}
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private UlidFactory(LongFunction<Ulid> ulidFunction, LongSupplier timeMillisNow) {
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this.ulidFunction = ulidFunction;
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this.timeMillisNow = timeMillisNow != null ? timeMillisNow : Clock.systemUTC()::millis;
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}
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/**
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* Returns a new factory.
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*
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* @param random a {@link Random} generator
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(Random random) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(random)));
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}
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/**
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* Returns a new factory.
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* <p>
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* It is equivalent to {@code new UlidFactory()}.
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*
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance() {
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return new UlidFactory(new UlidFunction(IRandom.newInstance()));
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}
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/**
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* Returns a new factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(LongSupplier randomFunction) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new factory.
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*
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* @param random a {@link Random} generator
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(Random random) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(random)));
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}
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/**
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* Returns a new factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(IntFunction<byte[]> randomFunction) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(LongSupplier randomFunction) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new monotonic factory.
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*
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance() {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance()));
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}
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/**
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* Returns a new factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newInstance(IntFunction<byte[]> randomFunction) {
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return new UlidFactory(new UlidFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new monotonic factory.
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*
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* @param random a {@link Random} generator
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(Random random) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(random)));
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}
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/**
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* Returns a new monotonic factory.
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*
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance() {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance()));
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(LongSupplier randomFunction) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new monotonic factory.
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*
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* @param random a {@link Random} generator
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(Random random) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(random)));
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(IntFunction<byte[]> randomFunction) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new monotonic factory.
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*
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* @param random a {@link Random} generator
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* @param timeMillisNow a function that returns the current time as milliseconds from epoch
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(Random random, LongSupplier timeMillisNow) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(random), timeMillisNow), timeMillisNow);
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @param clock a custom clock instance for tests
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* @return {@link UlidFactory}
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*/
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static UlidFactory newMonotonicInstance(LongSupplier randomFunction, Clock clock) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction), clock), clock);
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(LongSupplier randomFunction) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction)));
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @param clock a custom clock instance for tests
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* @return {@link UlidFactory}
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*/
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static UlidFactory newMonotonicInstance(IntFunction<byte[]> randomFunction, Clock clock) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction), clock), clock);
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(IntFunction<byte[]> randomFunction) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction)));
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}
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// ******************************
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// Public methods
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// ******************************
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @param timeMillisNow a function that returns the current time as milliseconds from epoch
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(LongSupplier randomFunction, LongSupplier timeMillisNow) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction), timeMillisNow), timeMillisNow);
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}
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/**
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* Returns a UUID.
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*
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* @return a ULID
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*/
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public synchronized Ulid create() {
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return this.ulidFunction.apply(clock.millis());
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a long value.
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*
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* @param randomFunction a random function that returns a long value
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* @param clock a custom clock instance for tests
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* @return {@link UlidFactory}
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*/
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static UlidFactory newMonotonicInstance(LongSupplier randomFunction, Clock clock) {
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return UlidFactory.newMonotonicInstance(randomFunction, clock::millis);
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}
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/**
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* Returns a UUID with a specific time.
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*
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* @param time a number of milliseconds since 1970-01-01 (Unix epoch).
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* @return a ULID
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*/
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public synchronized Ulid create(final long time) {
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return this.ulidFunction.apply(time);
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}
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @param timeMillisNow a function that returns the current time as milliseconds from epoch
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* @return {@link UlidFactory}
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*/
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public static UlidFactory newMonotonicInstance(IntFunction<byte[]> randomFunction, LongSupplier timeMillisNow) {
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return new UlidFactory(new MonotonicFunction(IRandom.newInstance(randomFunction), timeMillisNow), timeMillisNow);
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}
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// ******************************
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// Package-private inner classes
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// ******************************
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/**
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* Returns a new monotonic factory.
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* <p>
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* The given random function must return a byte array.
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*
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* @param randomFunction a random function that returns a byte array
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* @param clock a custom clock instance for tests
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* @return {@link UlidFactory}
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*/
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static UlidFactory newMonotonicInstance(IntFunction<byte[]> randomFunction, Clock clock) {
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return UlidFactory.newMonotonicInstance(randomFunction, clock::millis);
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}
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/**
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* Function that creates ULIDs.
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*/
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static final class UlidFunction implements LongFunction<Ulid> {
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// ******************************
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// Public methods
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// ******************************
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private final IRandom random;
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/**
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* Returns a UUID.
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*
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* @return a ULID
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*/
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public synchronized Ulid create() {
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return this.ulidFunction.apply(timeMillisNow.getAsLong());
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}
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public UlidFunction(IRandom random) {
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this.random = random;
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}
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/**
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* Returns a UUID with a specific time.
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*
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* @param time a number of milliseconds since 1970-01-01 (Unix epoch).
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* @return a ULID
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*/
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public synchronized Ulid create(final long time) {
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return this.ulidFunction.apply(time);
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}
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@Override
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public Ulid apply(final long time) {
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if (this.random instanceof ByteRandom) {
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return new Ulid(time, this.random.nextBytes(Ulid.RANDOM_BYTES));
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} else {
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final long msb = (time << 16) | (this.random.nextLong() & 0xffffL);
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final long lsb = this.random.nextLong();
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return new Ulid(msb, lsb);
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}
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}
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}
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// ******************************
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// Package-private inner classes
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// ******************************
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/**
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* Function that creates Monotonic ULIDs.
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*/
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static final class MonotonicFunction implements LongFunction<Ulid> {
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/**
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* Function that creates ULIDs.
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*/
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static final class UlidFunction implements LongFunction<Ulid> {
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private Ulid lastUlid;
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private final IRandom random;
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private final IRandom random;
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public UlidFunction(IRandom random) {
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this.random = random;
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}
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// Used to preserve monotonicity when the system clock is
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// adjusted by NTP after a small clock drift or when the
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// system clock jumps back by 1 second due to leap second.
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protected static final int CLOCK_DRIFT_TOLERANCE = 10_000;
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@Override
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public Ulid apply(final long time) {
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if (this.random instanceof ByteRandom) {
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return new Ulid(time, this.random.nextBytes(Ulid.RANDOM_BYTES));
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} else {
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final long msb = (time << 16) | (this.random.nextLong() & 0xffffL);
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final long lsb = this.random.nextLong();
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return new Ulid(msb, lsb);
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}
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}
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}
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public MonotonicFunction(IRandom random) {
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this(random, Clock.systemUTC());
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}
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/**
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* Function that creates Monotonic ULIDs.
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*/
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static final class MonotonicFunction implements LongFunction<Ulid> {
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public MonotonicFunction(IRandom random, Clock clock) {
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this.random = random;
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// initialize internal state
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this.lastUlid = new Ulid(clock.millis(), this.random.nextBytes(Ulid.RANDOM_BYTES));
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}
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private Ulid lastUlid;
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@Override
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public synchronized Ulid apply(final long time) {
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private final IRandom random;
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final long lastTime = lastUlid.getTime();
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// Used to preserve monotonicity when the system clock is
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// adjusted by NTP after a small clock drift or when the
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// system clock jumps back by 1 second due to leap second.
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protected static final int CLOCK_DRIFT_TOLERANCE = 10_000;
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// Check if the current time is the same as the previous time or has moved
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// backwards after a small system clock adjustment or after a leap second.
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// Drift tolerance = (previous_time - 10s) < current_time <= previous_time
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if ((time > lastTime - CLOCK_DRIFT_TOLERANCE) && (time <= lastTime)) {
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this.lastUlid = this.lastUlid.increment();
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} else {
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if (this.random instanceof ByteRandom) {
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this.lastUlid = new Ulid(time, this.random.nextBytes(Ulid.RANDOM_BYTES));
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} else {
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final long msb = (time << 16) | (this.random.nextLong() & 0xffffL);
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final long lsb = this.random.nextLong();
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this.lastUlid = new Ulid(msb, lsb);
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}
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}
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public MonotonicFunction(IRandom random) {
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this(random, Clock.systemUTC());
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}
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return new Ulid(this.lastUlid);
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}
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}
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public MonotonicFunction(IRandom random, Clock clock) {
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this(random, clock::millis);
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}
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static interface IRandom {
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public MonotonicFunction(IRandom random, LongSupplier timeMillisNow) {
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this.random = random;
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// initialize internal state
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this.lastUlid = new Ulid(timeMillisNow.getAsLong(), this.random.nextBytes(Ulid.RANDOM_BYTES));
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}
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public long nextLong();
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@Override
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public synchronized Ulid apply(final long time) {
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public byte[] nextBytes(int length);
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final long lastTime = lastUlid.getTime();
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static IRandom newInstance() {
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return new ByteRandom();
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}
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// Check if the current time is the same as the previous time or has moved
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// backwards after a small system clock adjustment or after a leap second.
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// Drift tolerance = (previous_time - 10s) < current_time <= previous_time
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if ((time > lastTime - CLOCK_DRIFT_TOLERANCE) && (time <= lastTime)) {
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this.lastUlid = this.lastUlid.increment();
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} else {
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if (this.random instanceof ByteRandom) {
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this.lastUlid = new Ulid(time, this.random.nextBytes(Ulid.RANDOM_BYTES));
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} else {
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final long msb = (time << 16) | (this.random.nextLong() & 0xffffL);
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final long lsb = this.random.nextLong();
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this.lastUlid = new Ulid(msb, lsb);
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}
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}
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static IRandom newInstance(Random random) {
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if (random == null) {
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return new ByteRandom();
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} else {
|
||||
if (random instanceof SecureRandom) {
|
||||
return new ByteRandom(random);
|
||||
} else {
|
||||
return new LongRandom(random);
|
||||
}
|
||||
}
|
||||
}
|
||||
return new Ulid(this.lastUlid);
|
||||
}
|
||||
}
|
||||
|
||||
static IRandom newInstance(LongSupplier randomFunction) {
|
||||
return new LongRandom(randomFunction);
|
||||
}
|
||||
static interface IRandom {
|
||||
|
||||
static IRandom newInstance(IntFunction<byte[]> randomFunction) {
|
||||
return new ByteRandom(randomFunction);
|
||||
}
|
||||
}
|
||||
public long nextLong();
|
||||
|
||||
static class LongRandom implements IRandom {
|
||||
public byte[] nextBytes(int length);
|
||||
|
||||
private final LongSupplier randomFunction;
|
||||
static IRandom newInstance() {
|
||||
return new ByteRandom();
|
||||
}
|
||||
|
||||
public LongRandom() {
|
||||
this(newRandomFunction(null));
|
||||
}
|
||||
static IRandom newInstance(Random random) {
|
||||
if (random == null) {
|
||||
return new ByteRandom();
|
||||
} else {
|
||||
if (random instanceof SecureRandom) {
|
||||
return new ByteRandom(random);
|
||||
} else {
|
||||
return new LongRandom(random);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public LongRandom(Random random) {
|
||||
this(newRandomFunction(random));
|
||||
}
|
||||
static IRandom newInstance(LongSupplier randomFunction) {
|
||||
return new LongRandom(randomFunction);
|
||||
}
|
||||
|
||||
public LongRandom(LongSupplier randomFunction) {
|
||||
this.randomFunction = randomFunction != null ? randomFunction : newRandomFunction(null);
|
||||
}
|
||||
static IRandom newInstance(IntFunction<byte[]> randomFunction) {
|
||||
return new ByteRandom(randomFunction);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public long nextLong() {
|
||||
return randomFunction.getAsLong();
|
||||
}
|
||||
static class LongRandom implements IRandom {
|
||||
|
||||
@Override
|
||||
public byte[] nextBytes(int length) {
|
||||
private final LongSupplier randomFunction;
|
||||
|
||||
int shift = 0;
|
||||
long random = 0;
|
||||
final byte[] bytes = new byte[length];
|
||||
public LongRandom() {
|
||||
this(newRandomFunction(null));
|
||||
}
|
||||
|
||||
for (int i = 0; i < length; i++) {
|
||||
if (shift < Byte.SIZE) {
|
||||
shift = Long.SIZE;
|
||||
random = randomFunction.getAsLong();
|
||||
}
|
||||
shift -= Byte.SIZE; // 56, 48, 40...
|
||||
bytes[i] = (byte) (random >>> shift);
|
||||
}
|
||||
public LongRandom(Random random) {
|
||||
this(newRandomFunction(random));
|
||||
}
|
||||
|
||||
return bytes;
|
||||
}
|
||||
public LongRandom(LongSupplier randomFunction) {
|
||||
this.randomFunction = randomFunction != null ? randomFunction : newRandomFunction(null);
|
||||
}
|
||||
|
||||
static LongSupplier newRandomFunction(Random random) {
|
||||
final Random entropy = random != null ? random : new SecureRandom();
|
||||
return entropy::nextLong;
|
||||
}
|
||||
}
|
||||
@Override
|
||||
public long nextLong() {
|
||||
return randomFunction.getAsLong();
|
||||
}
|
||||
|
||||
static class ByteRandom implements IRandom {
|
||||
@Override
|
||||
public byte[] nextBytes(int length) {
|
||||
|
||||
private final IntFunction<byte[]> randomFunction;
|
||||
int shift = 0;
|
||||
long random = 0;
|
||||
final byte[] bytes = new byte[length];
|
||||
|
||||
public ByteRandom() {
|
||||
this(newRandomFunction(null));
|
||||
}
|
||||
for (int i = 0; i < length; i++) {
|
||||
if (shift < Byte.SIZE) {
|
||||
shift = Long.SIZE;
|
||||
random = randomFunction.getAsLong();
|
||||
}
|
||||
shift -= Byte.SIZE; // 56, 48, 40...
|
||||
bytes[i] = (byte) (random >>> shift);
|
||||
}
|
||||
|
||||
public ByteRandom(Random random) {
|
||||
this(newRandomFunction(random));
|
||||
}
|
||||
return bytes;
|
||||
}
|
||||
|
||||
public ByteRandom(IntFunction<byte[]> randomFunction) {
|
||||
this.randomFunction = randomFunction != null ? randomFunction : newRandomFunction(null);
|
||||
}
|
||||
static LongSupplier newRandomFunction(Random random) {
|
||||
final Random entropy = random != null ? random : new SecureRandom();
|
||||
return entropy::nextLong;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public long nextLong() {
|
||||
long number = 0;
|
||||
byte[] bytes = this.randomFunction.apply(Long.BYTES);
|
||||
for (int i = 0; i < Long.BYTES; i++) {
|
||||
number = (number << 8) | (bytes[i] & 0xff);
|
||||
}
|
||||
return number;
|
||||
}
|
||||
static class ByteRandom implements IRandom {
|
||||
|
||||
@Override
|
||||
public byte[] nextBytes(int length) {
|
||||
return this.randomFunction.apply(length);
|
||||
}
|
||||
private final IntFunction<byte[]> randomFunction;
|
||||
|
||||
static IntFunction<byte[]> newRandomFunction(Random random) {
|
||||
final Random entropy = random != null ? random : new SecureRandom();
|
||||
return (final int length) -> {
|
||||
final byte[] bytes = new byte[length];
|
||||
entropy.nextBytes(bytes);
|
||||
return bytes;
|
||||
};
|
||||
}
|
||||
}
|
||||
public ByteRandom() {
|
||||
this(newRandomFunction(null));
|
||||
}
|
||||
|
||||
public ByteRandom(Random random) {
|
||||
this(newRandomFunction(random));
|
||||
}
|
||||
|
||||
public ByteRandom(IntFunction<byte[]> randomFunction) {
|
||||
this.randomFunction = randomFunction != null ? randomFunction : newRandomFunction(null);
|
||||
}
|
||||
|
||||
@Override
|
||||
public long nextLong() {
|
||||
long number = 0;
|
||||
byte[] bytes = this.randomFunction.apply(Long.BYTES);
|
||||
for (int i = 0; i < Long.BYTES; i++) {
|
||||
number = (number << 8) | (bytes[i] & 0xff);
|
||||
}
|
||||
return number;
|
||||
}
|
||||
|
||||
@Override
|
||||
public byte[] nextBytes(int length) {
|
||||
return this.randomFunction.apply(length);
|
||||
}
|
||||
|
||||
static IntFunction<byte[]> newRandomFunction(Random random) {
|
||||
final Random entropy = random != null ? random : new SecureRandom();
|
||||
return (final int length) -> {
|
||||
final byte[] bytes = new byte[length];
|
||||
entropy.nextBytes(bytes);
|
||||
return bytes;
|
||||
};
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue