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/*
* Copyright 2017 VMware, Inc.
*
* 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
*
* https://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 io.micrometer.core.aop;
import io.micrometer.core.annotation.Counted;
import io.micrometer.core.instrument.*;
import io.micrometer.core.lang.NonNullApi;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import java.lang.reflect.Method;
import java.util.concurrent.CompletionStage;
import java.util.function.Function;
import java.util.function.Predicate;
/**
*
* Aspect responsible for intercepting all methods annotated with the
* {@link Counted @Counted} annotation and recording a few counter metrics about their
* execution status.
* The aspect supports programmatic customizations through constructor-injectable custom
* logic.
*
*
* You might want to add tags programmatically to the {@link Counter}.
* In this case, the tags provider function
* (Function<ProceedingJoinPoint, Iterable<Tag>>) can help. It
* receives a {@link ProceedingJoinPoint} and returns the {@link Tag}s that will be
* attached to the {@link Counter}.
*
*
* You might also want to skip the {@link Counter} creation programmatically.
* One use-case can be having another component in your application that already processes
* the {@link Counted @Counted} annotation in some cases so that {@code CountedAspect}
* should not intercept these methods. By using the skip predicate
* (Predicate<ProceedingJoinPoint>) you can tell the
* {@code CountedAspect} when not to create a {@link Counter}.
*
* Here's a theoretic example to disable {@link Counter} creation for Spring controllers:
*
*
* @Bean
* public CountedAspect countedAspect(MeterRegistry meterRegistry) {
* return new CountedAspect(meterRegistry, this::skipControllers);
* }
*
* private boolean skipControllers(ProceedingJoinPoint pjp) {
* Class<?> targetClass = pjp.getTarget().getClass();
* return targetClass.isAnnotationPresent(RestController.class) || targetClass.isAnnotationPresent(Controller.class);
* }
*
*
* @author Ali Dehghani
* @author Jonatan Ivanov
* @since 1.2.0
* @see Counted
*/
@Aspect
@NonNullApi
public class CountedAspect {
private static final Predicate DONT_SKIP_ANYTHING = pjp -> false;
public final String DEFAULT_EXCEPTION_TAG_VALUE = "none";
public final String RESULT_TAG_FAILURE_VALUE = "failure";
public final String RESULT_TAG_SUCCESS_VALUE = "success";
/**
* The tag name to encapsulate the method execution status.
*/
private static final String RESULT_TAG = "result";
/**
* The tag name to encapsulate the exception thrown by the intercepted method.
*/
private static final String EXCEPTION_TAG = "exception";
/**
* Where we're going register metrics.
*/
private final MeterRegistry registry;
/**
* A function to produce additional tags for any given join point.
*/
private final Function> tagsBasedOnJoinPoint;
/**
* A predicate that decides if Timer creation should be skipped for the given join
* point.
*/
private final Predicate shouldSkip;
/**
* Creates a {@code CountedAspect} instance with {@link Metrics#globalRegistry}.
*
* @since 1.7.0
*/
public CountedAspect() {
this(Metrics.globalRegistry);
}
/**
* Creates a {@code CountedAspect} instance with the given {@code registry}.
* @param registry Where we're going to register metrics.
*/
public CountedAspect(MeterRegistry registry) {
this(registry, DONT_SKIP_ANYTHING);
}
/**
* Creates a {@code CountedAspect} instance with the given {@code registry} and tags
* provider function.
* @param registry Where we're going to register metrics.
* @param tagsBasedOnJoinPoint A function to generate tags given a join point.
*/
public CountedAspect(MeterRegistry registry, Function> tagsBasedOnJoinPoint) {
this(registry, tagsBasedOnJoinPoint, DONT_SKIP_ANYTHING);
}
/**
* Creates a {@code CountedAspect} instance with the given {@code registry} and skip
* predicate.
* @param registry Where we're going to register metrics.
* @param shouldSkip A predicate to decide if creating the timer should be skipped or
* not.
* @since 1.7.0
*/
public CountedAspect(MeterRegistry registry, Predicate shouldSkip) {
this(registry, pjp -> Tags.of("class", pjp.getStaticPart().getSignature().getDeclaringTypeName(), "method",
pjp.getStaticPart().getSignature().getName()), shouldSkip);
}
/**
* Creates a {@code CountedAspect} instance with the given {@code registry}, tags
* provider function and skip predicate.
* @param registry Where we're going to register metrics.
* @param tagsBasedOnJoinPoint A function to generate tags given a join point.
* @param shouldSkip A predicate to decide if creating the timer should be skipped or
* not.
* @since 1.7.0
*/
public CountedAspect(MeterRegistry registry, Function> tagsBasedOnJoinPoint,
Predicate shouldSkip) {
this.registry = registry;
this.tagsBasedOnJoinPoint = tagsBasedOnJoinPoint;
this.shouldSkip = shouldSkip;
}
/**
* Intercept methods annotated with the {@link Counted} annotation and expose a few
* counters about their execution status. By default, this aspect records both failed
* and successful attempts. If the {@link Counted#recordFailuresOnly()} is set to
* {@code true}, then the aspect would record only failed attempts. In case of a
* failure, the aspect tags the counter with the simple name of the thrown exception.
*
*
* When the annotated method returns a {@link CompletionStage} or any of its
* subclasses, the counters will be incremented only when the {@link CompletionStage}
* is completed. If completed exceptionally a failure is recorded, otherwise if
* {@link Counted#recordFailuresOnly()} is set to {@code false}, a success is
* recorded.
* @param pjp Encapsulates some information about the intercepted area.
* @param counted The annotation.
* @return Whatever the intercepted method returns.
* @throws Throwable When the intercepted method throws one.
*/
@Around("@annotation(counted)")
public Object interceptAndRecord(ProceedingJoinPoint pjp, Counted counted) throws Throwable {
if (shouldSkip.test(pjp)) {
return pjp.proceed();
}
final Method method = ((MethodSignature) pjp.getSignature()).getMethod();
final boolean stopWhenCompleted = CompletionStage.class.isAssignableFrom(method.getReturnType());
if (stopWhenCompleted) {
try {
return ((CompletionStage) pjp.proceed())
.whenComplete((result, throwable) -> recordCompletionResult(pjp, counted, throwable));
}
catch (Throwable e) {
record(pjp, counted, e.getClass().getSimpleName(), RESULT_TAG_FAILURE_VALUE);
throw e;
}
}
try {
Object result = pjp.proceed();
if (!counted.recordFailuresOnly()) {
record(pjp, counted, DEFAULT_EXCEPTION_TAG_VALUE, RESULT_TAG_SUCCESS_VALUE);
}
return result;
}
catch (Throwable e) {
record(pjp, counted, e.getClass().getSimpleName(), RESULT_TAG_FAILURE_VALUE);
throw e;
}
}
private void recordCompletionResult(ProceedingJoinPoint pjp, Counted counted, Throwable throwable) {
if (throwable != null) {
String exceptionTagValue = throwable.getCause() == null ? throwable.getClass().getSimpleName()
: throwable.getCause().getClass().getSimpleName();
record(pjp, counted, exceptionTagValue, RESULT_TAG_FAILURE_VALUE);
}
else if (!counted.recordFailuresOnly()) {
record(pjp, counted, DEFAULT_EXCEPTION_TAG_VALUE, RESULT_TAG_SUCCESS_VALUE);
}
}
private void record(ProceedingJoinPoint pjp, Counted counted, String exception, String result) {
counter(pjp, counted).tag(EXCEPTION_TAG, exception).tag(RESULT_TAG, result).tags(counted.extraTags())
.register(registry).increment();
}
private Counter.Builder counter(ProceedingJoinPoint pjp, Counted counted) {
Counter.Builder builder = Counter.builder(counted.value()).tags(tagsBasedOnJoinPoint.apply(pjp));
String description = counted.description();
if (!description.isEmpty()) {
builder.description(description);
}
return builder;
}
}