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ReducedMetric.java
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ReducedMetric.java
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/**
* 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.storm.metric.api;
public class ReducedMetric implements IMetric {
private final IReducer reducer;
private Object accumulator;
public ReducedMetric(IReducer reducer) {
this.reducer = reducer;
accumulator = this.reducer.init();
}
public void update(Object value) {
accumulator = reducer.reduce(accumulator, value);
}
@Override
public Object getValueAndReset() {
Object ret = reducer.extractResult(accumulator);
accumulator = reducer.init();
return ret;
}
}