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java/org/apache/tomcat/util/threads/TaskThread.java

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+/*
+ * 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.tomcat.util.threads;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ * A Thread implementation that records the time at which it was created.
+ *
+ */
+public class TaskThread extends Thread {
+
+    private static final Log log = LogFactory.getLog(TaskThread.class);
+    private final long creationTime;
+
+    public TaskThread(ThreadGroup group, Runnable target, String name) {
+        super(group, new WrappingRunnable(target), name);
+        this.creationTime = System.currentTimeMillis();
+    }
+
+    public TaskThread(ThreadGroup group, Runnable target, String name,
+            long stackSize) {
+        super(group, new WrappingRunnable(target), name, stackSize);
+        this.creationTime = System.currentTimeMillis();
+    }
+
+    /**
+     * @return the time (in ms) at which this thread was created
+     */
+    public final long getCreationTime() {
+        return creationTime;
+    }
+
+    /**
+     * Wraps a {@link Runnable} to swallow any {@link StopPooledThreadException}
+     * instead of letting it go and potentially trigger a break in a debugger.
+     */
+    private static class WrappingRunnable implements Runnable {
+        private Runnable wrappedRunnable;
+        WrappingRunnable(Runnable wrappedRunnable) {
+            this.wrappedRunnable = wrappedRunnable;
+        }
+        @Override
+        public void run() {
+            try {
+                wrappedRunnable.run();
+            } catch(StopPooledThreadException exc) {
+                //expected : we just swallow the exception to avoid disturbing
+                //debuggers like eclipse's
+                log.debug("Thread exiting on purpose", exc);
+            }
+        }
+
+    }
+
+}