/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.waveprotocol.box.server.stat;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.inject.Singleton;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.waveprotocol.box.stat.Timed;
import org.waveprotocol.box.stat.Timer;
import org.waveprotocol.box.stat.Timing;
import java.lang.reflect.Method;
/**
* Intercepts method calls that have a {@link Timed} annotation.
*
* @author dhanji@gmail.com (Dhanji R. Prasanna)
* @author David Byttow
*/
@Singleton
public class TimingInterceptor implements MethodInterceptor {
private LoadingCache<Method, String> nameCache =
CacheBuilder.newBuilder().build(new CacheLoader<Method, String>() {
@Override
public String load(Method method) throws Exception {
return method.getDeclaringClass().getSimpleName() + "." + method.getName();
}
});
@Override
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
Method method = methodInvocation.getMethod();
Timed timed = method.getAnnotation(Timed.class);
String name = timed.value();
if (name.isEmpty()) {
name = nameCache.get(methodInvocation.getMethod());
}
Timer timer;
if (timed.isRequest()) {
timer = Timing.startRequest(name, timed.threshold());
} else {
timer = Timing.start(name, timed.threshold());
}
try {
return methodInvocation.proceed();
} finally {
Timing.stop(timer);
}
}
}