/*
* 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 org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.xd.analytics.metrics.core.Counter;
import org.springframework.xd.analytics.metrics.core.CounterRepository;
import org.springframework.xd.store.AbstractInMemoryRepository;
/**
* Memory backed implementation of Counter repository that uses a ConcurrentMap.
*
* @author Mark Pollack
* @author Eric Bottard
*
*/
@Qualifier("simple")
public class InMemoryCounterRepository extends AbstractInMemoryRepository<Counter, String> implements CounterRepository {
@Override
public long increment(String name) {
return increment(name, 1L);
}
@Override
public long increment(String name, long amount) {
Counter c = getOrCreate(name);
return c.increment(amount);
}
@Override
public synchronized long decrement(String name) {
Counter c = getOrCreate(name);
return c.decrement(1L);
}
@Override
public synchronized void reset(String name) {
save(new Counter(name));
}
private synchronized Counter getOrCreate(String name) {
Counter result = findOne(name);
if (result == null) {
result = new Counter(name);
result = save(result);
}
return result;
}
@Override
protected String keyFor(Counter entity) {
return entity.getName();
}
}