init

2024-11-30 19:03:49 +08:00
commit 1e6763c160
3806 changed files with 737676 additions and 0 deletions
--- a/java/org/apache/catalina/tribes/util/UUIDGenerator.java
+++ b/java/org/apache/catalina/tribes/util/UUIDGenerator.java
@@ -0,0 +1,93 @@
+/*
+ * 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.catalina.tribes.util;
+
+import java.security.SecureRandom;
+import java.util.Random;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ * simple generation of a UUID
+ * @version 1.0
+ */
+public class UUIDGenerator {
+    private static final Log log = LogFactory.getLog(UUIDGenerator.class);
+    protected static final StringManager sm =
+        StringManager.getManager("org.apache.catalina.tribes.util");
+
+    public static final int UUID_LENGTH = 16;
+    public static final int UUID_VERSION = 4;
+    public static final int BYTES_PER_INT = 4;
+    public static final int BITS_PER_BYTE = 8;
+
+    protected static final SecureRandom secrand;
+    protected static final Random rand = new Random();
+
+    static {
+        long start = System.currentTimeMillis();
+        secrand = new SecureRandom();
+        // seed the generator
+        secrand.nextInt();
+        long time = System.currentTimeMillis() - start;
+        if (time > 100) {
+            log.info(sm.getString("uuidGenerator.createRandom",
+                    secrand.getAlgorithm(), Long.valueOf(time)));
+        }
+    }
+
+    public static byte[] randomUUID(boolean secure) {
+        byte[] result = new byte[UUID_LENGTH];
+        return randomUUID(secure,result,0);
+    }
+
+    public static byte[] randomUUID(boolean secure, byte[] into, int offset) {
+        if ( (offset+UUID_LENGTH)>into.length )
+            throw new ArrayIndexOutOfBoundsException(sm.getString("uuidGenerator.unable.fit",
+                    Integer.toString(UUID_LENGTH), Integer.toString(into.length),
+                    Integer.toString(offset+UUID_LENGTH)));
+        Random r = (secure&&(secrand!=null))?secrand:rand;
+        nextBytes(into,offset,UUID_LENGTH,r);
+        into[6+offset] &= 0x0F;
+        into[6+offset] |= (UUID_VERSION << 4);
+        into[8+offset] &= 0x3F; //0011 1111
+        into[8+offset] |= 0x80; //1000 0000
+        return into;
+    }
+
+    /**
+     * Same as java.util.Random.nextBytes except this one we dont have to allocate a new byte array
+     * @param into byte[]
+     * @param offset int
+     * @param length int
+     * @param r Random
+     */
+    public static void nextBytes(byte[] into, int offset, int length, Random r) {
+        int numRequested = length;
+        int numGot = 0, rnd = 0;
+        while (true) {
+            for (int i = 0; i < BYTES_PER_INT; i++) {
+                if (numGot == numRequested) return;
+                rnd = (i == 0 ? r.nextInt() : rnd >> BITS_PER_BYTE);
+                into[offset+numGot] = (byte) rnd;
+                numGot++;
+            }
+        }
+    }
+
+}