carterkozak commented on a change in pull request #452: URL: https://github.com/apache/logging-log4j2/pull/452#discussion_r553354888
########## File path: log4j-core/src/main/java/org/apache/logging/log4j/core/appender/AsyncAppenderEventForwarder.java ########## @@ -0,0 +1,147 @@ +/* + * 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.appender; + +import org.apache.logging.log4j.Logger; +import org.apache.logging.log4j.core.LogEvent; +import org.apache.logging.log4j.core.config.AppenderControl; +import org.apache.logging.log4j.core.util.Log4jThread; +import org.apache.logging.log4j.status.StatusLogger; + +import java.util.List; +import java.util.concurrent.BlockingQueue; +import java.util.concurrent.atomic.AtomicLong; + +class AsyncAppenderEventForwarder extends Log4jThread { + + private static final AtomicLong THREAD_COUNTER = new AtomicLong(0); + + private static final Logger LOGGER = StatusLogger.getLogger(); + + private final AppenderControl errorAppender; + + private final List<AppenderControl> appenders; + + private final BlockingQueue<LogEvent> queue; + + private volatile boolean stopped; + + AsyncAppenderEventForwarder( + final String name, + final AppenderControl errorAppender, + final List<AppenderControl> appenders, + final BlockingQueue<LogEvent> queue) { + super("AsyncAppenderEventForwarder-" + THREAD_COUNTER.incrementAndGet() + "-" + name); + this.errorAppender = errorAppender; + this.appenders = appenders; + this.queue = queue; + this.stopped = false; + } + + @Override + public void run() { + LOGGER.trace("{} has started.", getName()); + forwardAll(); + forwardRemaining(); + } + + private void forwardAll() { + while (!stopped) { + LogEvent event; + try { + event = queue.take(); + } catch (final InterruptedException ignored) { + // Restore the interrupted flag cleared when the exception is caught. + interrupt(); + break; + } + event.setEndOfBatch(queue.isEmpty()); + forwardOne(event); + } + LOGGER.trace("{} has stopped.", getName()); + } + + private void forwardRemaining() { + int eventCount = 0; + while (true) { + // Note the non-blocking Queue#poll() method! + final LogEvent event = queue.poll(); + if (event == null) { + break; + } + event.setEndOfBatch(queue.isEmpty()); + forwardOne(event); + eventCount++; + } + LOGGER.trace( + "{} has processed the last {} remaining event(s).", + getName(), eventCount); + } + + void forwardOne(final LogEvent event) { Review comment: +1 I don't think forward is correct here or in the class name. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
