hadoop LogExactlyOnce 源码
haddop LogExactlyOnce 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/store/LogExactlyOnce.java
/*
* 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.hadoop.fs.store;
import java.util.concurrent.atomic.AtomicBoolean;
import org.slf4j.Logger;
/**
* Log exactly once, even across threads.
*/
public class LogExactlyOnce {
private final AtomicBoolean logged = new AtomicBoolean(false);
private final Logger log;
public LogExactlyOnce(final Logger log) {
this.log = log;
}
public void warn(String format, Object...args) {
if (!logged.getAndSet(true)) {
log.warn(format, args);
}
}
public void info(String format, Object...args) {
if (!logged.getAndSet(true)) {
log.info(format, args);
}
}
public void error(String format, Object...args) {
if (!logged.getAndSet(true)) {
log.error(format, args);
}
}
}
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