hadoop MetricsRecordFiltered 源码
haddop MetricsRecordFiltered 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsRecordFiltered.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.metrics2.impl;
import java.util.Iterator;
import java.util.Collection;
import org.apache.hadoop.thirdparty.com.google.common.collect.AbstractIterator;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricsFilter;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsTag;
class MetricsRecordFiltered extends AbstractMetricsRecord {
private final MetricsRecord delegate;
private final MetricsFilter filter;
MetricsRecordFiltered(MetricsRecord delegate, MetricsFilter filter) {
this.delegate = delegate;
this.filter = filter;
}
@Override public long timestamp() {
return delegate.timestamp();
}
@Override public String name() {
return delegate.name();
}
@Override public String description() {
return delegate.description();
}
@Override public String context() {
return delegate.context();
}
@Override public Collection<MetricsTag> tags() {
return delegate.tags();
}
@Override public Iterable<AbstractMetric> metrics() {
return new Iterable<AbstractMetric>() {
final Iterator<AbstractMetric> it = delegate.metrics().iterator();
@Override public Iterator<AbstractMetric> iterator() {
return new AbstractIterator<AbstractMetric>() {
@Override public AbstractMetric computeNext() {
while (it.hasNext()) {
AbstractMetric next = it.next();
if (filter.accepts(next.name())) {
return next;
}
}
return endOfData();
}
};
}
};
}
}
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