pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / util / NamedThreadFactory.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/NamedThreadFactory.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/NamedThreadFactory.java
new file mode 100644 (file)
index 0000000..5308493
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/NamedThreadFactory.java
@@ -0,0 +1,67 @@
+package org.apache.lucene.util;
+
+/**
+ * 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.
+ */
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * A default {@link ThreadFactory} implementation that accepts the name prefix
+ * of the created threads as a constructor argument. Otherwise, this factory
+ * yields the same semantics as the thread factory returned by
+ * {@link Executors#defaultThreadFactory()}.
+ */
+public class NamedThreadFactory implements ThreadFactory {
+  private static final AtomicInteger threadPoolNumber = new AtomicInteger(1);
+  private final ThreadGroup group;
+  private final AtomicInteger threadNumber = new AtomicInteger(1);
+  private static final String NAME_PATTERN = "%s-%d-thread";
+  private final String threadNamePrefix;
+
+  /**
+   * Creates a new {@link NamedThreadFactory} instance
+   * 
+   * @param threadNamePrefix the name prefix assigned to each thread created.
+   */
+  public NamedThreadFactory(String threadNamePrefix) {
+    final SecurityManager s = System.getSecurityManager();
+    group = (s != null) ? s.getThreadGroup() : Thread.currentThread()
+        .getThreadGroup();
+    this.threadNamePrefix = String.format(NAME_PATTERN,
+        checkPrefix(threadNamePrefix), threadPoolNumber.getAndIncrement());
+  }
+
+  private static String checkPrefix(String prefix) {
+    return prefix == null || prefix.length() == 0 ? "Lucene" : prefix;
+  }
+
+  /**
+   * Creates a new {@link Thread}
+   * 
+   * @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
+   */
+  public Thread newThread(Runnable r) {
+    final Thread t = new Thread(group, r, String.format("%s-%d",
+        this.threadNamePrefix, threadNumber.getAndIncrement()), 0);
+    t.setDaemon(false);
+    t.setPriority(Thread.NORM_PRIORITY);
+    return t;
+  }
+
+}