| /* |
| * 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.logging.log4j.core.async; |
| |
| import com.lmax.disruptor.LifecycleAware; |
| import com.lmax.disruptor.Sequence; |
| import com.lmax.disruptor.SequenceReportingEventHandler; |
| |
| /** |
| * This event handler gets passed messages from the RingBuffer as they become |
| * available. Processing of these messages is done in a separate thread, |
| * controlled by the {@code Executor} passed to the {@code Disruptor} |
| * constructor. |
| */ |
| public class RingBufferLogEventHandler implements |
| SequenceReportingEventHandler<RingBufferLogEvent>, LifecycleAware { |
| |
| private static final int NOTIFY_PROGRESS_THRESHOLD = 50; |
| private Sequence sequenceCallback; |
| private int counter; |
| private long threadId = -1; |
| |
| @Override |
| public void setSequenceCallback(final Sequence sequenceCallback) { |
| this.sequenceCallback = sequenceCallback; |
| } |
| |
| @Override |
| public void onEvent(final RingBufferLogEvent event, final long sequence, |
| final boolean endOfBatch) throws Exception { |
| try { |
| event.execute(endOfBatch); |
| } |
| finally { |
| event.clear(); |
| // notify the BatchEventProcessor that the sequence has progressed. |
| // Without this callback the sequence would not be progressed |
| // until the batch has completely finished. |
| notifyCallback(sequence); |
| } |
| } |
| |
| private void notifyCallback(final long sequence) { |
| if (++counter > NOTIFY_PROGRESS_THRESHOLD) { |
| sequenceCallback.set(sequence); |
| counter = 0; |
| } |
| } |
| |
| /** |
| * Returns the thread ID of the background consumer thread, or {@code -1} if the background thread has not started |
| * yet. |
| * @return the thread ID of the background consumer thread, or {@code -1} |
| */ |
| public long getThreadId() { |
| return threadId; |
| } |
| |
| @Override |
| public void onStart() { |
| threadId = Thread.currentThread().getId(); |
| } |
| |
| @Override |
| public void onShutdown() { |
| } |
| } |