Add constructors in UlidFactory for random generators #12

New constructors:

- public UlidFactory(Random random) { }
- public UlidFactory(RandomGenerator randomGenerator) { }

CHANGELOG.md

@@ -4,12 +4,18 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
-### Fixed
+## [3.2.0] - 2021-07-17
 
-- Fixed typos in `CHANGELOG.md`
+Simplified the use of `UlidFactory` with other random generators.
+
+### Added
+
+- Added constructors in `UlidFactory` for random generators.
 
 ## [3.1.1] - 2021-07-17
 
+Creates a module name be used in Java 9+.
+
 ### Added
 
 - Added module name for Java 9+
@@ -233,7 +239,8 @@ Project created as an alternative Java implementation of [ULID spec](https://git
 - Added `LICENSE`
 - Added test cases
 
-[unreleased]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.1.1...HEAD
+[unreleased]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.2.0...HEAD
+[3.1.0]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.1.1...ulid-creator-3.2.0
 [3.1.0]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.1.0...ulid-creator-3.1.1
 [3.1.0]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.0.1...ulid-creator-3.1.0
 [3.0.1]: https://github.com/f4b6a3/ulid-creator/compare/ulid-creator-3.0.0...ulid-creator-3.0.1

README.md

@@ -35,7 +35,7 @@ Add these lines to your `pom.xml`.
 <dependency>
   <groupId>com.github.f4b6a3</groupId>
   <artifactId>ulid-creator</artifactId>
-  <version>3.1.1</version>
+  <version>3.2.0</version>
 </dependency>
 ```
 See more options in [maven.org](https://search.maven.org/artifact/com.github.f4b6a3/ulid-creator).
@@ -194,22 +194,20 @@ byte[] random = ulid.getRandom(); // 10 bytes (80 bits)
 byte[] random = Ulid.getRandom("0123456789ABCDEFGHJKMNPQRS"); // 10 bytes (80 bits)
 ```
 
-Use a `UlidFactory` instance with `java.util.Random` to generate ULIDs:
+Use a `UlidFactory` with `java.util.Random`:
 
 ```java
-Random random = new Random();
-UlidFactory factory = UlidCreator.getDefaultFactory().withRandomGenerator(random::nextBytes);
-
+// use a `Random` instance
+UlidFactory factory = new DefaultFactory(new Random());
 Ulid ulid = factory.create();
 ```
 
-Use a `UlidFactory` instance with any random generator you like(*) to generate ULIDs:
+Use a `UlidFactory` with a random generator of your choice:
 
 ```java
+// use a method of any RNG with this signature: `void nextBytes(byte[])`
 import com.github.niceguy.random.AwesomeRandom; // a hypothetical RNG
-AwesomeRandom awesomeRandom = new AwesomeRandom();
-UlidFactory factory = UlidCreator.getDefaultFactory().withRandomGenerator(awesomeRandom::nextBytes);
-
+UlidFactory factory = new DefaultFactory(new AwesomeRandom()::nextBytes);
 Ulid ulid = factory.create();
 ```
 
@@ -244,5 +242,6 @@ See: [uuid-creator-benchmark](https://github.com/fabiolimace/uuid-creator-benchm
 Other generators
 -------------------------------------------
 * [UUID Creator](https://github.com/f4b6a3/uuid-creator): for generating UUIDs
-* [TSID Creator](https://github.com/f4b6a3/tsid-creator): for generating Time Sortable IDs
+* [TSID Creator](https://github.com/f4b6a3/tsid-creator): for generating TSIDs
+* [KSUID Creator](https://github.com/f4b6a3/ksuid-creator): for generating KSUIDs
 

src/main/java/com/github/f4b6a3/ulid/Ulid.java

@@ -365,7 +365,8 @@ public final class Ulid implements Serializable, Comparable<Ulid> {
 	 * The output string is 26 characters long and contains only characters from
 	 * Crockford's base 32 alphabet.
 	 * 
-	 * It is at least twice as fast as {@code Ulid.toString().toLowerCase()}.
+	 * It is a shorthand at least twice as fast as
+	 * {@code Ulid.toString().toLowerCase()}.
 	 * 
 	 * See: https://www.crockford.com/base32.html
 	 * 
@@ -619,7 +620,13 @@ public final class Ulid implements Serializable, Comparable<Ulid> {
 	/**
 	 * Converts the ULID into a canonical string in upper case.
 	 * 
-	 * It is the same as {@code Ulid.toUpperCase()}.
+	 * The output string is 26 characters long and contains only characters from
+	 * Crockford's base 32 alphabet.
+	 * 
+	 * For lower case string, use the shorthand {@code Ulid#toLowerCase()}, instead
+	 * of {@code Ulid#toString()#toLowerCase()}.
+	 * 
+	 * See: https://www.crockford.com/base32.html
 	 * 
 	 * @return a ULID string
 	 */

src/main/java/com/github/f4b6a3/ulid/UlidCreator.java

@@ -24,8 +24,8 @@
 
 package com.github.f4b6a3.ulid;
 
-import com.github.f4b6a3.ulid.factory.DefaultUlidFactory;
-import com.github.f4b6a3.ulid.factory.MonotonicUlidFactory;
+import com.github.f4b6a3.ulid.factory.DefaultFactory;
+import com.github.f4b6a3.ulid.factory.MonotonicFactory;
 import com.github.f4b6a3.ulid.factory.UlidFactory;
 
 /**
@@ -92,29 +92,11 @@ public final class UlidCreator {
 		return MonotonicFactoryHolder.INSTANCE.create(time);
 	}
 
-	/**
-	 * Returns an instance of the Default ULID factory.
-	 * 
-	 * @return a ULID factory
-	 */
-	public static UlidFactory getDefaultFactory() {
-		return new DefaultUlidFactory();
-	}
-
-	/**
-	 * Returns an instance of the Monotonic ULID factory.
-	 * 
-	 * @return a ULID factory
-	 */
-	public static UlidFactory getMonotonicFactory() {
-		return new MonotonicUlidFactory();
-	}
-
 	private static class DefaultFactoryHolder {
-		static final UlidFactory INSTANCE = getDefaultFactory();
+		static final UlidFactory INSTANCE = new DefaultFactory();
 	}
 
 	private static class MonotonicFactoryHolder {
-		static final UlidFactory INSTANCE = getMonotonicFactory();
+		static final UlidFactory INSTANCE = new MonotonicFactory();
 	}
 }

src/main/java/com/github/f4b6a3/ulid/factory/DefaultFactory.java

@@ -24,16 +24,44 @@
 
 package com.github.f4b6a3.ulid.factory;
 
+import java.util.Random;
+
 import com.github.f4b6a3.ulid.Ulid;
+import com.github.f4b6a3.ulid.random.RandomGenerator;
 
 /**
- * Factory that generates default ULIDs.
+ * Factory that generates ULIDs.
  * 
  * The random component is always reset to a new random value.
  * 
  * The maximum ULIDs that can be generated per millisecond is 2^80.
  */
-public class DefaultUlidFactory extends UlidFactory {
+public class DefaultFactory extends UlidFactory {
+
+	/**
+	 * Use the default {@link java.security.SecureRandom}.
+	 */
+	public DefaultFactory() {
+		super();
+	}
+
+	/**
+	 * Use a random generator that inherits from {@link Random}.
+	 * 
+	 * @param random a {@link Random} instance
+	 */
+	public DefaultFactory(Random random) {
+		this(random::nextBytes);
+	}
+
+	/**
+	 * Use a random generator that inherits from {@link RandomGenerator}.
+	 * 
+	 * @param randomGenerator a {@link RandomGenerator} instance
+	 */
+	public DefaultFactory(RandomGenerator randomGenerator) {
+		super(randomGenerator);
+	}
 
 	/**
 	 * Returns a ULID.

src/main/java/com/github/f4b6a3/ulid/factory/MonotonicFactory.java

@@ -24,23 +24,52 @@
 
 package com.github.f4b6a3.ulid.factory;
 
+import java.util.Random;
+
 import com.github.f4b6a3.ulid.Ulid;
+import com.github.f4b6a3.ulid.random.RandomGenerator;
 
 /**
  * Factory that generates Monotonic ULIDs.
  * 
- * The random component is reset to a new value every time the millisecond changes.
+ * The random component is reset to a new value every time the millisecond
+ * changes.
  * 
  * If more than one ULID is generated within the same millisecond, the random
  * component is incremented by one.
  * 
  * The maximum ULIDs that can be generated per millisecond is 2^80.
  */
-public final class MonotonicUlidFactory extends UlidFactory {
+public final class MonotonicFactory extends UlidFactory {
 
 	private long lastTime = -1;
 	private Ulid lastUlid = null;
 
+	/**
+	 * Use the default {@link java.security.SecureRandom}.
+	 */
+	public MonotonicFactory() {
+		super();
+	}
+
+	/**
+	 * Use a random generator that inherits from {@link Random}.
+	 * 
+	 * @param random a {@link Random} instance
+	 */
+	public MonotonicFactory(Random random) {
+		this(random::nextBytes);
+	}
+
+	/**
+	 * Use a random generator that inherits from {@link RandomGenerator}.
+	 * 
+	 * @param randomGenerator a {@link RandomGenerator} instance
+	 */
+	public MonotonicFactory(RandomGenerator randomGenerator) {
+		super(randomGenerator);
+	}
+
 	/**
 	 * Returns a ULID.
 	 * 

src/main/java/com/github/f4b6a3/ulid/factory/UlidFactory.java

@@ -24,10 +24,9 @@
 
 package com.github.f4b6a3.ulid.factory;
 
-import java.util.Random;
+import java.security.SecureRandom;
 
 import com.github.f4b6a3.ulid.Ulid;
-import com.github.f4b6a3.ulid.random.DefaultRandomGenerator;
 import com.github.f4b6a3.ulid.random.RandomGenerator;
 
 /**
@@ -39,8 +38,20 @@ public abstract class UlidFactory {
 
 	protected RandomGenerator randomGenerator;
 
+	/**
+	 * Use the default {@link java.security.SecureRandom}.
+	 */
 	public UlidFactory() {
-		this.randomGenerator = new DefaultRandomGenerator();
+		this(new SecureRandom()::nextBytes);
+	}
+
+	/**
+	 * Use a random generator that inherits from {@link RandomGenerator}.
+	 * 
+	 * @param randomGenerator a {@link RandomGenerator} instance
+	 */
+	public UlidFactory(RandomGenerator randomGenerator) {
+		this.randomGenerator = randomGenerator;
 	}
 
 	/**
@@ -61,21 +72,4 @@ public abstract class UlidFactory {
 	 * @return a ULID
 	 */
 	public abstract Ulid create(final long time);
-
-	/**
-	 * Replaces the default random generator with another.
-	 * 
-	 * The default random generator uses {@link java.security.SecureRandom}.
-	 * 
-	 * See {@link Random}.
-	 * 
-	 * @param <T>             the type parameter
-	 * @param randomGenerator a random generator
-	 * @return {@link UlidFactory}
-	 */
-	@SuppressWarnings("unchecked")
-	public synchronized <T extends UlidFactory> T withRandomGenerator(RandomGenerator randomGenerator) {
-		this.randomGenerator = randomGenerator;
-		return (T) this;
-	}
 }

src/main/java/com/github/f4b6a3/ulid/random/DefaultRandomGenerator.java

@@ -1,41 +0,0 @@
-/*
- * MIT License
- * 
- * Copyright (c) 2018-2020 Fabio Lima
- * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package com.github.f4b6a3.ulid.random;
-
-import java.security.SecureRandom;
-import java.util.Random;
-
-/**
- * It uses an instance of {@link java.security.SecureRandom}.
- */
-public final class DefaultRandomGenerator implements RandomGenerator {
-
-	private static final Random SECURE_RANDOM = new SecureRandom();
-
-	@Override
-	public void nextBytes(byte[] bytes) {
-		SECURE_RANDOM.nextBytes(bytes);
-	}
-}

src/test/java/com/github/f4b6a3/ulid/TestSuite.java

@@ -3,13 +3,13 @@ package com.github.f4b6a3.ulid;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 
-import com.github.f4b6a3.ulid.factory.DefaultUlidFactoryTest;
-import com.github.f4b6a3.ulid.factory.MonotonicUlidFactoryTest;
+import com.github.f4b6a3.ulid.factory.DefaultFactoryTest;
+import com.github.f4b6a3.ulid.factory.MonotonicFactoryTest;
 
 @RunWith(Suite.class)
 @Suite.SuiteClasses({
-	MonotonicUlidFactoryTest.class,
-	DefaultUlidFactoryTest.class,
+	MonotonicFactoryTest.class,
+	DefaultFactoryTest.class,
 	UlidTest.class,
 })
 

src/test/java/com/github/f4b6a3/ulid/UlidTest.java

@@ -71,7 +71,7 @@ public class UlidTest {
 		}
 
 		try {
-			long time = 0x1000000000000000L; // negative number
+			long time = 0x8000000000000000L; // negative number
 			byte[] bytes = new byte[Ulid.RANDOM_BYTES_LENGTH];
 			new Ulid(time, bytes);
 			fail("Should throw an exception");

src/test/java/com/github/f4b6a3/ulid/UniquenessTest.java

@@ -1,7 +1,9 @@
 package com.github.f4b6a3.ulid;
 
 import java.util.HashSet;
-import com.github.f4b6a3.ulid.UlidCreator;
+import java.util.Random;
+
+import com.github.f4b6a3.ulid.factory.MonotonicFactory;
 import com.github.f4b6a3.ulid.factory.UlidFactory;
 
 /**
@@ -117,8 +119,7 @@ public class UniquenessTest {
 	}
 
 	public static void execute(boolean verbose, int threadCount, int requestCount) {
-		UlidFactory factory = UlidCreator.getMonotonicFactory();
-
+		UlidFactory factory = new MonotonicFactory(new Random());
 		UniquenessTest test = new UniquenessTest(threadCount, requestCount, factory, verbose);
 		test.start();
 	}

src/test/java/com/github/f4b6a3/ulid/factory/DefaultFactoryTest.java

@@ -11,7 +11,7 @@ import static org.junit.Assert.*;
 import java.util.HashSet;
 import java.util.Random;
 
-public class DefaultUlidFactoryTest extends UlidFactoryTest {
+public class DefaultFactoryTest extends UlidFactoryTest {
 
 	@Test
 	public void testGetUlid() {
@@ -67,8 +67,7 @@ public class DefaultUlidFactoryTest extends UlidFactoryTest {
 
 		// Instantiate and start many threads
 		for (int i = 0; i < THREAD_TOTAL; i++) {
-			Random random = new Random();
-			UlidFactory factory = UlidCreator.getDefaultFactory().withRandomGenerator(random::nextBytes);
+			UlidFactory factory = new DefaultFactory(new Random());
 			threads[i] = new TestThread(factory, DEFAULT_LOOP_MAX);
 			threads[i].start();
 		}

src/test/java/com/github/f4b6a3/ulid/factory/MonotonicFactoryTest.java

@@ -12,7 +12,7 @@ import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Random;
 
-public class MonotonicUlidFactoryTest extends UlidFactoryTest {
+public class MonotonicFactoryTest extends UlidFactoryTest {
 
 	@Test
 	public void testGetUlid() {
@@ -78,8 +78,7 @@ public class MonotonicUlidFactoryTest extends UlidFactoryTest {
 
 		// Instantiate and start many threads
 		for (int i = 0; i < THREAD_TOTAL; i++) {
-			Random random = new Random();
-			UlidFactory factory = UlidCreator.getMonotonicFactory().withRandomGenerator(random::nextBytes);
+			UlidFactory factory = new MonotonicFactory(new Random());
 			threads[i] = new TestThread(factory, DEFAULT_LOOP_MAX);
 			threads[i].start();
 		}