X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.api.uuid%2Fsrc%2Forg%2Fargeo%2Fapi%2Fuuid%2FUuidFactory.java;h=4ab6c2e4b754d7818be29a24fece361373b5f6e9;hb=5f820a14abf7371714514ed5f20580ceb5edaeec;hp=91191dae2bf1fd17a4138048685a8e8d62515ad5;hpb=5550fa28a7578ce6dbc50d1f94bb4740c1f3ec32;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/UuidFactory.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/UuidFactory.java
index 91191dae2..4ab6c2e4b 100644
--- a/org.argeo.api.uuid/src/org/argeo/api/uuid/UuidFactory.java
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/UuidFactory.java
@@ -17,6 +17,18 @@ import java.util.function.Supplier;
  * @see https://datatracker.ietf.org/doc/html/rfc4122
  */
 public interface UuidFactory extends Supplier<UUID> {
+
+	/*
+	 * DEFAULT
+	 */
+	/**
+	 * The default {@link UUID} to provide, either random (v4) or time based (v1).
+	 * It SHOULD wrap either {@link #timeUUID()} (recommended) or
+	 * {@link #randomUUID()}.
+	 */
+	@Override
+	UUID get();
+
 	/*
 	 * TIME-BASED (version 1)
 	 */
@@ -120,16 +132,6 @@ public interface UuidFactory extends Supplier<UUID> {
 		return randomUUIDStrong();
 	}
 
-	/**
-	 * The default {@link UUID} to provide, either random (v4) or time based (v1).
-	 * This default implementations returns {@link #timeUUID()} because it is
-	 * supposed to be fast and use few resources.
-	 */
-	@Override
-	default UUID get() {
-		return timeUUID();
-	}
-
 	/*
 	 * STANDARD UUIDs
 	 */
@@ -157,6 +159,14 @@ public interface UuidFactory extends Supplier<UUID> {
 	 */
 	final static UUID NAMESPACE_UUID_X500 = UUID.fromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8");
 
+	/*
+	 * BIT LEVEL CONSTANTS
+	 */
+	/** Base for the most significant bit of version 1 (time based) UUIDs. */
+	long MOST_SIG_VERSION1 = (1l << 12);
+	/** Base for the least significant part of RFC4122 (variant 2) UUIDs. */
+	long LEAST_SIG_RFC4122_VARIANT = (1l << 63);
+
 	/*
 	 * UTILITIES
 	 */
@@ -187,4 +197,30 @@ public interface UuidFactory extends Supplier<UUID> {
 	static boolean isNameBased(UUID uuid) {
 		return uuid.version() == 3 || uuid.version() == 5;
 	}
+
+	/**
+	 * The state of a time based UUID generator, as described and discussed in
+	 * section 4.2.1 of RFC4122.
+	 * 
+	 * @see https://datatracker.ietf.org/doc/html/rfc4122#section-4.2.1
+	 */
+	interface TimeUuidState {
+		/** Current node id and clock sequence for this thread. */
+		long getLeastSignificantBits();
+
+		/** A new current timestamp for this thread. */
+		long getMostSignificantBits();
+
+		/**
+		 * The last timestamp which was produced by this thread, as returned by
+		 * {@link UUID#timestamp()}.
+		 */
+		long getLastTimestamp();
+
+		/**
+		 * The current clock sequence for this thread, as returned by
+		 * {@link UUID#clockSequence()}.
+		 */
+		long getClockSequence();
+	}
 }