io.github.resilience4j.bulkhead.configure.RxJava2BulkheadAspectExt Maven / Gradle / Ivy

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Resilience4j is a lightweight, easy-to-use fault tolerance library designed for Java8 and functional programming
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/*
 * Copyright 2019 Mahmoud Romeh
 *
 * 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.bulkhead.configure;

import io.github.resilience4j.bulkhead.Bulkhead;
import io.github.resilience4j.bulkhead.operator.BulkheadOperator;
import io.reactivex.*;
import org.aspectj.lang.ProceedingJoinPoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Set;

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

/**
 * the Rx bulkhead logic support for the spring AOP conditional on the presence of Rx classes on the
 * spring class loader
 */
public class RxJava2BulkheadAspectExt implements BulkheadAspectExt {

    private static final Logger logger = LoggerFactory.getLogger(RxJava2BulkheadAspectExt.class);
    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
     */
    @SuppressWarnings("unchecked")
    @Override
    public boolean canHandleReturnType(Class returnType) {
        return rxSupportedTypes.stream()
            .anyMatch(classType -> classType.isAssignableFrom(returnType));
    }

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

    @SuppressWarnings("unchecked")
    private Object executeRxJava2Aspect(BulkheadOperator bulkheadOperator, Object returnValue) {
        if (returnValue instanceof ObservableSource) {
            Observable observable = (Observable) returnValue;
            return observable.compose(bulkheadOperator);
        } else if (returnValue instanceof SingleSource) {
            Single single = (Single) returnValue;
            return single.compose(bulkheadOperator);
        } else if (returnValue instanceof CompletableSource) {
            Completable completable = (Completable) returnValue;
            return completable.compose(bulkheadOperator);
        } else if (returnValue instanceof MaybeSource) {
            Maybe maybe = (Maybe) returnValue;
            return maybe.compose(bulkheadOperator);
        } else if (returnValue instanceof Flowable) {
            Flowable flowable = (Flowable) returnValue;
            return flowable.compose(bulkheadOperator);
        } else {
            logger.error("Unsupported type for BulkHead RxJava2 {}",
                returnValue.getClass().getTypeName());
            throw new IllegalArgumentException(
                "Not Supported type for the BulkHead in RxJava2 :" + returnValue.getClass()
                    .getName());
        }
    }
}