svn commit: r407900 - /logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java

[ca...@apache.org]

Author: carnold
Date: Fri May 19 13:08:34 2006
New Revision: 407900

URL: http://svn.apache.org/viewvc?rev=407900&view=rev
Log:
Bug 38982: Add non-blocking option for AsyncAppender

Added:
    logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java

Added: logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java
URL: http://svn.apache.org/viewvc/logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java?rev=407900&view=auto
==============================================================================
--- logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java (added)
+++ logging/log4j/branches/v1_2-branch/src/java/org/apache/log4j/Dispatcher.java Fri May 19 13:08:34 2006
@@ -0,0 +1,124 @@
+/*
+ * Copyright 1999,2005 The Apache Software Foundation.
+ *
+ * Licensed 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.log4j;
+
+import org.apache.log4j.helpers.AppenderAttachableImpl;
+import org.apache.log4j.spi.LoggingEvent;
+
+
+/**
+ * Obsolete AsyncAppender dispatcher provided for compatibility only.
+ *
+ * @deprecated Since 1.3.
+ */
+class Dispatcher extends Thread {
+    /**
+     * @deprecated
+     */
+  private org.apache.log4j.helpers.BoundedFIFO bf;
+  private AppenderAttachableImpl aai;
+  private boolean interrupted = false;
+  AsyncAppender container;
+
+    /**
+     *
+     * @param bf
+     * @param container
+     * @deprecated
+     */
+  Dispatcher(org.apache.log4j.helpers.BoundedFIFO bf, AsyncAppender container) {
+    this.bf = bf;
+    this.container = container;
+    this.aai = container.aai;
+
+    // It is the user's responsibility to close appenders before
+    // exiting.
+    this.setDaemon(true);
+
+    // set the dispatcher priority to lowest possible value
+    this.setPriority(Thread.MIN_PRIORITY);
+    this.setName("Dispatcher-" + getName());
+
+    // set the dispatcher priority to MIN_PRIORITY plus or minus 2
+    // depending on the direction of MIN to MAX_PRIORITY.
+    //+ (Thread.MAX_PRIORITY > Thread.MIN_PRIORITY ? 1 : -1)*2);
+  }
+
+  void close() {
+    synchronized (bf) {
+      interrupted = true;
+
+      // We have a waiting dispacther if and only if bf.length is
+      // zero.  In that case, we need to give it a death kiss.
+      if (bf.length() == 0) {
+        bf.notify();
+      }
+    }
+  }
+
+  /**
+   * The dispatching strategy is to wait until there are events in the buffer
+   * to process. After having processed an event, we release the monitor
+   * (variable bf) so that new events can be placed in the buffer, instead of
+   * keeping the monitor and processing the remaining events in the buffer.
+   *
+   * <p>
+   * Other approaches might yield better results.
+   * </p>
+   */
+  public void run() {
+    //Category cat = Category.getInstance(Dispatcher.class.getName());
+    LoggingEvent event;
+
+    while (true) {
+      synchronized (bf) {
+        if (bf.length() == 0) {
+          // Exit loop if interrupted but only if the the buffer is empty.
+          if (interrupted) {
+            //cat.info("Exiting.");
+            break;
+          }
+
+          try {
+            //LogLog.debug("Waiting for new event to dispatch.");
+            bf.wait();
+          } catch (InterruptedException e) {
+            break;
+          }
+        }
+
+        event = bf.get();
+
+        if (bf.wasFull()) {
+          //LogLog.debug("Notifying AsyncAppender about freed space.");
+          bf.notify();
+        }
+      }
+
+      // synchronized
+      synchronized (container.aai) {
+        if ((aai != null) && (event != null)) {
+          aai.appendLoopOnAppenders(event);
+        }
+      }
+    }
+
+    // while
+    // close and remove all appenders
+    aai.removeAllAppenders();
+  }
+}



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