/*
* Copyright 2011-2013 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.integration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessagingException;
import org.springframework.util.Assert;
import org.springframework.xd.analytics.metrics.core.GaugeRepository;
/**
* @author David Turanski
* @author Luke Taylor
*
*/
public class GaugeHandler {
private final GaugeRepository gaugeRepository;
private final String name;
public GaugeHandler(GaugeRepository gaugeRepository, String name) {
Assert.notNull(gaugeRepository, "Gauge Repository can not be null");
Assert.notNull(name, "Gauge Name can not be null");
this.gaugeRepository = gaugeRepository;
this.name = name;
}
@ServiceActivator
public void process(Message<?> message) {
if (message != null) {
long value = convertToLong(message.getPayload());
this.gaugeRepository.setValue(name, value);
}
}
/**
* @param payload
* @return long value
*/
long convertToLong(Object payload) {
if (payload != null) {
if (payload instanceof Number) {
return ((Number) payload).longValue();
}
else if (payload instanceof String) {
try {
return Long.parseLong((String) payload);
}
catch (Exception e) {
throw new MessagingException("cannot convert payload to long", e);
}
}
}
throw new MessagingException("cannot convert "
+ (payload == null ? "null" : payload.getClass().getName() + " to long"));
}
}