/*
* Copyright 2013 the original author or authors.
*
* Licensed 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.springframework.xd.analytics.metrics.memory;
import java.util.Map;
import org.springframework.xd.analytics.metrics.core.FieldValueCounter;
import org.springframework.xd.analytics.metrics.core.FieldValueCounterRepository;
/**
* Memory backed implementation of FieldValueCounterRepository that uses a ConcurrentMap
*
* @author Mark Pollack
*
*/
public class InMemoryFieldValueCounterRepository extends InMemoryMetricRepository<FieldValueCounter> implements
FieldValueCounterRepository {
@Override
protected FieldValueCounter create(String name) {
return new FieldValueCounter(name);
}
@Override
public synchronized void increment(String name, String fieldName) {
modifyFieldValue(name, fieldName, 1);
}
@Override
public synchronized void decrement(String name, String fieldName) {
modifyFieldValue(name, fieldName, -1);
}
@Override
public void reset(String name, String fieldName) {
FieldValueCounter counter = getOrCreate(name);
Map<String, Double> data = counter.getFieldValueCount();
if (data.containsKey(fieldName)) {
data.put(fieldName, 0D);
}
}
private void modifyFieldValue(String name, String fieldName, double delta) {
FieldValueCounter counter = getOrCreate(name);
Map<String, Double> data = counter.getFieldValueCount();
double count = data.containsKey(fieldName) ? data.get(fieldName) : 0;
data.put(fieldName, count + delta);
save(counter);
}
}