com.clicktravel.cheddar.application.continuation.DeferResultAspect.java Source code

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Here is the source code for com.clicktravel.cheddar.application.continuation.DeferResultAspect.java

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/*
 * Copyright 2014 Click Travel Ltd
 *
 * 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 com.clicktravel.cheddar.application.continuation;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Aspect
@Order(300)
@Component
public class DeferResultAspect {

    private final ContinuationHandler continuationHandler;

    @Autowired
    public DeferResultAspect(final ContinuationHandler continuationHandler) {
        this.continuationHandler = continuationHandler;
    }

    @Around("@annotation(com.clicktravel.cheddar.application.continuation.DeferResult)")
    public Object invokeAndDeferResult(final ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        continuationHandler.createContinuation();
        try {
            proceedingJoinPoint.proceed(); // discard returned value
            return continuationHandler.pollForMethodReturnValue();
        } finally {
            continuationHandler.removeContinuation();
        }
    }

}