/*
* Copyright 2014 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.integration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
import org.springframework.xd.analytics.metrics.core.CounterRepository;
/**
* Counts the number of non-null messages using an underlying {@link CounterRepository}.
*
*/
public class MessageCounterHandler {
private final CounterRepository counterRepository;
private final String counterName;
public MessageCounterHandler(CounterRepository counterRepository, String counterName) {
Assert.notNull(counterRepository, "Counter Repository can not be null");
Assert.notNull(counterName, "Counter Name can not be null");
this.counterRepository = counterRepository;
this.counterName = counterName;
}
@ServiceActivator
public Message<?> process(Message<?> message) {
if (message != null) {
this.counterRepository.increment(counterName);
}
return message;
}
}