| /** |
| * 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.apache.aurora.common.inject; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| import java.lang.reflect.Method; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.inject.Binder; |
| import com.google.inject.matcher.Matchers; |
| |
| import org.aopalliance.intercept.MethodInterceptor; |
| import org.aopalliance.intercept.MethodInvocation; |
| import org.apache.aurora.common.stats.SlidingStats; |
| import org.apache.aurora.common.stats.TimeSeriesRepository; |
| import org.apache.commons.lang.StringUtils; |
| |
| /** |
| * A method interceptor that exports timing information for methods annotated with |
| * {@literal @Timed}. |
| * |
| * @author John Sirois |
| */ |
| public final class TimedInterceptor implements MethodInterceptor { |
| |
| /** |
| * Marks a method as a target for timing. |
| */ |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target(ElementType.METHOD) |
| public @interface Timed { |
| |
| /** |
| * The base name to export timing data with; empty to use the annotated method's name. |
| */ |
| String value() default ""; |
| } |
| |
| private final LoadingCache<Method, SlidingStats> stats = |
| CacheBuilder.newBuilder().build(new CacheLoader<Method, SlidingStats>() { |
| @Override public SlidingStats load(Method method) { |
| return createStats(method); |
| } |
| }); |
| |
| private TimedInterceptor() { |
| // preserve for guice |
| } |
| |
| private SlidingStats createStats(Method method) { |
| Timed timed = method.getAnnotation(Timed.class); |
| Preconditions.checkArgument(timed != null, |
| "TimedInterceptor can only be applied to @Timed methods"); |
| |
| String name = timed.value(); |
| String statName = !StringUtils.isEmpty(name) ? name : method.getName(); |
| return new SlidingStats(statName, "nanos"); |
| } |
| |
| @Override |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| // TODO(John Sirois): consider including a SlidingRate tracking thrown exceptions |
| SlidingStats stat = stats.get(methodInvocation.getMethod()); |
| long start = System.nanoTime(); |
| try { |
| return methodInvocation.proceed(); |
| } finally { |
| stat.accumulate(System.nanoTime() - start); |
| } |
| } |
| |
| /** |
| * Installs an interceptor in a guice {@link com.google.inject.Injector}, enabling |
| * {@literal @Timed} method interception in guice-provided instances. Requires that a |
| * {@link TimeSeriesRepository} is bound elsewhere. |
| * |
| * @param binder a guice binder to require bindings against |
| */ |
| public static void bind(Binder binder) { |
| Preconditions.checkNotNull(binder); |
| |
| Bindings.requireBinding(binder, TimeSeriesRepository.class); |
| |
| TimedInterceptor interceptor = new TimedInterceptor(); |
| binder.requestInjection(interceptor); |
| binder.bindInterceptor(Matchers.any(), Matchers.annotatedWith(Timed.class), interceptor); |
| } |
| } |