QPID-1221: added customizable UUID generation and switched the default strategy to use nameUUIDFromBytes rather than randomUUID

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk@683337 13f79535-47bb-0310-9956-ffa450edef68

4 files changed, 193 insertions, 0 deletions

diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java b/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java
new file mode 100644
index 0000000000..e764c8536b
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java
@@ -0,0 +1,59 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.util;
+
+import java.nio.ByteBuffer;
+import java.util.UUID;
+
+
+/**
+ * NameUUIDGen
+ *
+ */
+
+public final class NameUUIDGen implements UUIDGen
+{
+
+    private static final int WIDTH = 8;
+
+    final private byte[] seed;
+    final private ByteBuffer seedBuf;
+    private long counter;
+
+    public NameUUIDGen()
+    {
+        String namespace = UUID.randomUUID().toString();
+        this.seed = new byte[namespace.length() + WIDTH];
+        for (int i = WIDTH; i < seed.length; i++)
+        {
+            seed[i] = (byte) namespace.charAt(i - WIDTH);
+        }
+        this.seedBuf = ByteBuffer.wrap(seed);
+        this.counter = 0;
+    }
+
+    public UUID generate()
+    {
+        seedBuf.putLong(0, counter++);
+        return UUID.nameUUIDFromBytes(seed);
+    }
+
+}
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/RandomUUIDGen.java b/qpid/java/common/src/main/java/org/apache/qpid/util/RandomUUIDGen.java
new file mode 100644
index 0000000000..60b402a105
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/util/RandomUUIDGen.java
@@ -0,0 +1,39 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.util;
+
+import java.util.UUID;
+
+
+/**
+ * RandomUUIDGen
+ *
+ */
+
+public final class RandomUUIDGen implements UUIDGen
+{
+
+    public UUID generate()
+    {
+        return UUID.randomUUID();
+    }
+
+}
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDGen.java b/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDGen.java
new file mode 100644
index 0000000000..3cfe5afdac
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDGen.java
@@ -0,0 +1,36 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.util;
+
+
+import java.util.UUID;
+
+/**
+ * UUIDGen
+ *
+ */
+
+public interface UUIDGen
+{
+
+    public UUID generate();
+
+}
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDs.java b/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDs.java
new file mode 100644
index 0000000000..4bf6b7f0a2
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/util/UUIDs.java
@@ -0,0 +1,59 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.util;
+
+
+/**
+ * UUIDs
+ *
+ */
+
+public final class UUIDs
+{
+
+    public static final UUIDGen newGenerator()
+    {
+        return newGenerator(System.getProperty("qpid.uuid.generator",
+                                               NameUUIDGen.class.getName()));
+    }
+
+    public static UUIDGen newGenerator(String name)
+    {
+        try
+        {
+            Class cls = Class.forName(name);
+            return (UUIDGen) cls.newInstance();
+        }
+        catch (InstantiationException e)
+        {
+            throw new RuntimeException(e);
+        }
+        catch (IllegalAccessException e)
+        {
+            throw new RuntimeException(e);
+        }
+        catch (ClassNotFoundException e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+}