hadoop NoopSpan 源码
haddop NoopSpan 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/audit/impl/NoopSpan.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.audit.impl;
import org.apache.hadoop.fs.s3a.audit.AuditSpanS3A;
/**
* A minimal span with no direct side effects.
* It does have an ID and, if given callbacks,
* will notify the callback implementation
* of activation and deactivation.
* Subclassable for tests.
*/
public class NoopSpan extends AbstractAuditSpanImpl {
private final String path1;
private final String path2;
/** Activation callbacks. */
private final SpanActivationCallbacks activationCallbacks;
/**
* Static public instance.
*/
public static final NoopSpan INSTANCE = new NoopSpan();
/**
* Create a no-op span.
* @param spanId span ID
* @param operationName operation name
* @param path1 path
* @param path2 path 2
* @param activationCallbacks Activation callbacks.
*/
protected NoopSpan(String spanId,
final String operationName,
final String path1,
final String path2,
final SpanActivationCallbacks activationCallbacks) {
super(spanId, operationName);
this.path1 = path1;
this.path2 = path2;
this.activationCallbacks = activationCallbacks;
}
protected NoopSpan() {
this("", "no-op", null, null, null);
}
@Override
public AuditSpanS3A activate() {
if (activationCallbacks != null) {
activationCallbacks.activate(this);
}
return this;
}
@Override
public void deactivate() {
if (activationCallbacks != null) {
activationCallbacks.deactivate(this);
}
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("NoopSpan{");
sb.append("id='").append(getSpanId()).append('\'');
sb.append("name='").append(getOperationName()).append('\'');
sb.append(", path1='").append(path1).append('\'');
sb.append(", path2='").append(path2).append('\'');
sb.append('}');
return sb.toString();
}
/** Activation callbacks. */
public interface SpanActivationCallbacks {
/**
* Span was activated.
* @param span span reference.
*/
void activate(AuditSpanS3A span);
/**
* Span was deactivated.
* @param span span reference.
*/
void deactivate(AuditSpanS3A span);
}
}
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hadoop AbstractAuditSpanImpl 源码
hadoop AbstractOperationAuditor 源码
hadoop ActiveAuditManagerS3A 源码
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