/*
* Copyright 2012-2015 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.boot.actuate.metrics.writer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;
/**
* A {@link MessageHandler} that updates {@link Metric} values through a
* {@link MetricWriter}.
*
* @author Dave Syer
* @see MessageChannelMetricWriter
*/
public final class MetricWriterMessageHandler implements MessageHandler {
private static final Log logger = LogFactory.getLog(MetricWriterMessageHandler.class);
private final MetricWriter observer;
public MetricWriterMessageHandler(MetricWriter observer) {
this.observer = observer;
}
@Override
public void handleMessage(Message<?> message) throws MessagingException {
handleMessage(new MetricMessage(message));
}
private void handleMessage(MetricMessage message) {
Object payload = message.getPayload();
if (message.isReset()) {
this.observer.reset(message.getMetricName());
}
else if (payload instanceof Delta) {
Delta<?> value = (Delta<?>) payload;
this.observer.increment(value);
}
else if (payload instanceof Metric) {
Metric<?> value = (Metric<?>) payload;
this.observer.set(value);
}
else {
if (logger.isWarnEnabled()) {
logger.warn("Unsupported metric payload "
+ (payload == null ? "null" : payload.getClass().getName()));
}
}
}
}