LOG4J2-1121 - Add LockingReliabilityStrategy
Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo Commit: http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/d524ef3e Tree: http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/d524ef3e Diff: http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/d524ef3e Branch: refs/heads/master Commit: d524ef3e1fae639732a2cc713f68cc2e6e508b8a Parents: 5f95edf Author: Ralph Goers <[email protected]> Authored: Sat Sep 19 21:45:18 2015 -0700 Committer: Ralph Goers <[email protected]> Committed: Sat Sep 19 21:45:18 2015 -0700 ---------------------------------------------------------------------- .../core/config/LockingReliabilityStrategy.java | 124 +++++++++++++++++++ 1 file changed, 124 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/d524ef3e/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LockingReliabilityStrategy.java ---------------------------------------------------------------------- diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LockingReliabilityStrategy.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LockingReliabilityStrategy.java new file mode 100644 index 0000000..9ba74e0 --- /dev/null +++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LockingReliabilityStrategy.java @@ -0,0 +1,124 @@ +/* + * 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.config; + +import org.apache.logging.log4j.Level; +import org.apache.logging.log4j.Marker; +import org.apache.logging.log4j.core.LogEvent; +import org.apache.logging.log4j.message.Message; +import org.apache.logging.log4j.util.Supplier; + +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.locks.*; + +/** + * ReliabilityStrategy that counts the number of threads that have started to log an event but have not completed yet, + * and waits for these threads to finish before allowing the appenders to be stopped. + */ +public class LockingReliabilityStrategy implements ReliabilityStrategy { + private static final int MAX_RETRIES = 3; + private final AtomicInteger counter = new AtomicInteger(); + private final AtomicBoolean shutdown = new AtomicBoolean(false); + private final Lock shutdownLock = new ReentrantLock(); + private final Condition noLogEvents = shutdownLock.newCondition(); // should only be used when shutdown == true + private final LoggerConfig loggerConfig; + private final ReadWriteLock reconfigureLock = new ReentrantReadWriteLock(); + private volatile boolean isStopping = false; + + public LockingReliabilityStrategy(final LoggerConfig loggerConfig) { + this.loggerConfig = loggerConfig; + } + + /* (non-Javadoc) + * @see org.apache.logging.log4j.core.config.ReliabilityStrategy#log(org.apache.logging.log4j.util.Supplier, java.lang.String, java.lang.String, org.apache.logging.log4j.Marker, org.apache.logging.log4j.Level, org.apache.logging.log4j.message.Message, java.lang.Throwable) + */ + @Override + public void log(final Supplier<LoggerConfig> reconfigured, final String loggerName, final String fqcn, + final Marker marker, final Level level, final Message data, final Throwable t) { + + final LoggerConfig config = getActiveLoggerConfig(reconfigured); + try { + config.log(loggerName, fqcn, marker, level, data, t); + } finally { + config.getReliabilityStrategy().afterLogEvent(); + } + } + + /* (non-Javadoc) + * @see org.apache.logging.log4j.core.config.ReliabilityStrategy#log(org.apache.logging.log4j.util.Supplier, org.apache.logging.log4j.core.LogEvent) + */ + @Override + public void log(final Supplier<LoggerConfig> reconfigured, final LogEvent event) { + final LoggerConfig config = getActiveLoggerConfig(reconfigured); + try { + config.log(event); + } finally { + config.getReliabilityStrategy().afterLogEvent(); + } + } + + /* (non-Javadoc) + * @see org.apache.logging.log4j.core.config.ReliabilityStrategy#beforeLogEvent(org.apache.logging.log4j.core.config.LoggerConfig, org.apache.logging.log4j.util.Supplier) + */ + @Override + public LoggerConfig getActiveLoggerConfig(final Supplier<LoggerConfig> next) { + LoggerConfig result = this.loggerConfig; + if (!beforeLogEvent()) { + result = next.get(); + return result.getReliabilityStrategy().getActiveLoggerConfig(next); + } + return result; + } + + private boolean beforeLogEvent() { + reconfigureLock.readLock().lock(); + if (isStopping) { + reconfigureLock.readLock().unlock(); + return false; + } + return true; + } + + public void afterLogEvent() { + reconfigureLock.readLock().unlock(); + } + + /* (non-Javadoc) + * @see org.apache.logging.log4j.core.config.ReliabilityStrategy#beforeStopAppenders() + */ + @Override + public void beforeStopAppenders() { + reconfigureLock.writeLock().lock(); + try { + isStopping = true; + } finally { + reconfigureLock.writeLock().unlock(); + } + } + + /* (non-Javadoc) + * @see org.apache.logging.log4j.core.config.ReliabilityStrategy#beforeStopConfiguration(org.apache.logging.log4j.core.config.Configuration) + */ + @Override + public void beforeStopConfiguration(Configuration configuration) { + // no action + } + +}
