hadoop ActiveThreadSpanSource 源码
haddop ActiveThreadSpanSource 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/store/audit/ActiveThreadSpanSource.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.audit;
/**
* Interface to get the active thread span.
* This can be used to collect the active span to
* propagate it into other threads.
*
* FileSystems which track their active span may implement
* this and offer their active span.
*/
public interface ActiveThreadSpanSource<T extends AuditSpan> {
/**
* The active span. This may not be a valid span, i.e. there is no guarantee
* that {@code getActiveAuditSpan().isValidSpan()} is true, but
* implementations MUST always return a non-null span.
* @return the currently active span.
*/
T getActiveAuditSpan();
}
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