hadoop ActiveOperationContext 源码
haddop ActiveOperationContext 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/ActiveOperationContext.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.s3a.impl;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.fs.s3a.statistics.S3AStatisticsContext;
/**
* Context for any active operation.
*/
public class ActiveOperationContext {
/**
* An operation ID; currently just for logging...proper tracing needs more.
*/
private final long operationId;
/**
* Statistics context.
*/
private final S3AStatisticsContext statisticsContext;
public ActiveOperationContext(
final long operationId,
final S3AStatisticsContext statisticsContext) {
this.operationId = operationId;
this.statisticsContext = Objects.requireNonNull(statisticsContext,
"null statistics context");
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(
"ActiveOperation{");
sb.append("operationId=").append(operationId);
sb.append('}');
return sb.toString();
}
public long getOperationId() {
return operationId;
}
public S3AStatisticsContext getS3AStatisticsContext() {
return statisticsContext;
}
private static final AtomicLong NEXT_OPERATION_ID = new AtomicLong(0);
/**
* Create an operation ID. The nature of it should be opaque.
* @return an ID for the constructor.
*/
protected static long newOperationId() {
return NEXT_OPERATION_ID.incrementAndGet();
}
}
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