/* LatencyTracker.java
*
* Copyright 2009-2012 Comcast Interactive Media, LLC.
*
* 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.fishwife.jrugged;
import java.util.concurrent.Callable;
/**
* This is a statistics wrapper that records the latency of requests, both for successes
* and failures. The most recent measurement is available for query, and can be polled
* periodically to determine average latencies.
*/
public class LatencyTracker implements ServiceWrapper {
private long lastSuccessMillis;
private long lastFailureMillis;
@Override
public <T> T invoke(final Callable<T> c) throws Exception {
final long start = System.currentTimeMillis();
try {
final T result = c.call();
lastSuccessMillis = System.currentTimeMillis() - start;
return result;
} catch (final Exception e) {
lastFailureMillis = System.currentTimeMillis() - start;
throw e;
}
}
@Override
public void invoke(final Runnable r) throws Exception {
final long start = System.currentTimeMillis();
try {
r.run();
lastSuccessMillis = System.currentTimeMillis() - start;
} catch (final Exception e) {
lastFailureMillis = System.currentTimeMillis() - start;
throw e;
}
}
@Override
public <T> T invoke(final Runnable r, final T result) throws Exception {
final long start = System.currentTimeMillis();
try {
r.run();
lastSuccessMillis = System.currentTimeMillis() - start;
return result;
} catch (final Exception e) {
lastFailureMillis = System.currentTimeMillis() - start;
throw e;
}
}
/**
* Returns how long the last successful request took.
*
* @return long request service time in milliseconds
*/
public long getLastSuccessMillis() {
return lastSuccessMillis;
}
/**
* Returns how long the last failed request took.
*
* @return long request service time in milliseconds.
*/
public long getLastFailureMillis() {
return lastFailureMillis;
}
}