Creating a branch for experimenting with some ideas for JMS client.rajith_jms_client

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/rajith_jms_client@1128369 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 60 insertions, 0 deletions

diff --git a/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java b/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java
new file mode 100644
index 0000000000..192675edcd
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java
@@ -0,0 +1,60 @@
+/*
+ *
+ * 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.thread;
+
+import java.lang.Thread.UncaughtExceptionHandler;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * An {@link UncaughtExceptionHandler} that writes the exception to the application log via
+ * the SLF4J framework.  Once registered with {@link Thread#setUncaughtExceptionHandler(UncaughtExceptionHandler)}
+ * it will be invoked by the JVM when a thread has been <i>abruptly</i> terminated due to an uncaught exception.
+ * Owing to the contract of {@link Runnable#run()}, the only possible exception types which can cause such a termination
+ * are instances of {@link RuntimeException} and {@link Error}.  These exceptions are catastrophic and the client must
+ * restart the JVM.
+ * <p>
+ * The implementation also invokes {@link ThreadGroup#uncaughtException(Thread, Throwable)}.  This
+ * is done to retain compatibility with any monitoring solutions (for example, log scraping of
+ * standard error) that existing users of older Qpid client libraries may have in place.
+ *
+ */
+public class LoggingUncaughtExceptionHandler implements UncaughtExceptionHandler
+{
+    private static final Logger _logger = LoggerFactory.getLogger(LoggingUncaughtExceptionHandler.class);
+
+    @Override
+    public void uncaughtException(Thread t, Throwable e)
+    {
+        try
+        {
+            _logger.error("Uncaught exception in thread \"{}\"", t.getName(), e);
+        }
+        finally
+        {
+            // Invoke the thread group's handler too for compatibility with any
+            // existing clients who are already scraping stderr for such conditions.
+            t.getThreadGroup().uncaughtException(t, e);
+        }
+    }
+}
\ No newline at end of file