io.github.resilience4j.timelimiter.configure.RxJava2TimeLimiterAspectExt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of resilience4j-spring Show documentation

Resilience4j is a lightweight, easy-to-use fault tolerance library designed for Java8 and functional programming

There is a newer version: 2.2.0

/*
 * Copyright 2020 Ingyu Hwang
 *
 * 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 io.github.resilience4j.timelimiter.configure;

import io.github.resilience4j.timelimiter.TimeLimiter;
import io.github.resilience4j.timelimiter.transformer.TimeLimiterTransformer;
import io.reactivex.*;
import org.aspectj.lang.ProceedingJoinPoint;

import java.util.Set;

import static io.github.resilience4j.utils.AspectUtil.newHashSet;

public class RxJava2TimeLimiterAspectExt implements TimeLimiterAspectExt {

    private final Set> rxSupportedTypes = newHashSet(ObservableSource.class,
        SingleSource.class, CompletableSource.class, MaybeSource.class, Flowable.class);

    /**
     * @param returnType the AOP method return type class
     * @return boolean if the method has Rx java 2 rerun type
     */
    @Override
    public boolean canHandleReturnType(Class returnType) {
        return rxSupportedTypes.stream().anyMatch(classType -> classType.isAssignableFrom(returnType));
    }

    /**
     * @param proceedingJoinPoint Spring AOP proceedingJoinPoint
     * @param timeLimiter         the configured timeLimiter
     * @param methodName          the method name
     * @return the result object
     * @throws Throwable exception in case of faulty flow
     */
    @Override
    public Object handle(ProceedingJoinPoint proceedingJoinPoint, TimeLimiter timeLimiter, String methodName)
        throws Throwable {
        TimeLimiterTransformer timeLimiterTransformer = TimeLimiterTransformer.of(timeLimiter);
        Object returnValue = proceedingJoinPoint.proceed();
        return executeRxJava2Aspect(timeLimiterTransformer, returnValue, methodName);
    }

    @SuppressWarnings("unchecked")
    private static Object executeRxJava2Aspect(TimeLimiterTransformer timeLimiterTransformer,
        Object returnValue, String methodName) {
        if (returnValue instanceof ObservableSource) {
            Observable observable = (Observable) returnValue;
            return observable.compose(timeLimiterTransformer);
        } else if (returnValue instanceof SingleSource) {
            Single single = (Single) returnValue;
            return single.compose(timeLimiterTransformer);
        } else if (returnValue instanceof CompletableSource) {
            Completable completable = (Completable) returnValue;
            return completable.compose(timeLimiterTransformer);
        } else if (returnValue instanceof MaybeSource) {
            Maybe maybe = (Maybe) returnValue;
            return maybe.compose(timeLimiterTransformer);
        } else if (returnValue instanceof Flowable) {
            Flowable flowable = (Flowable) returnValue;
            return flowable.compose(timeLimiterTransformer);
        } else {
            throw new IllegalReturnTypeException(returnValue.getClass(), methodName,
                "RxJava2 expects Flowable/Single/...");
        }
    }
}