io.micronaut.scheduling.async.AsyncInterceptor Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 original authors
 *
 * 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.micronaut.scheduling.async;

import io.micronaut.aop.InterceptPhase;
import io.micronaut.aop.MethodInterceptor;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.context.BeanLocator;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.async.publisher.Publishers;
import io.micronaut.core.type.ReturnType;
import io.micronaut.inject.qualifiers.Qualifiers;
import io.micronaut.scheduling.TaskExecutors;
import io.micronaut.scheduling.annotation.Async;
import io.micronaut.scheduling.exceptions.TaskExecutionException;
import io.reactivex.Flowable;
import io.reactivex.schedulers.Schedulers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Named;
import javax.inject.Provider;
import javax.inject.Singleton;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.function.BiConsumer;

/**
 * Interceptor implementation for the {@link Async} annotation.
 *
 * @author graemerocher
 * @since 1.0
 */
@Singleton
@Internal
public class AsyncInterceptor implements MethodInterceptor {

    private static final Logger LOG = LoggerFactory.getLogger(TaskExecutors.class);
    private final BeanLocator beanLocator;
    private final Optional> scheduledExecutorService;
    private final Map scheduledExecutorServices = new ConcurrentHashMap<>();

    /**
     * Default constructor.
     *
     * @param beanLocator The bean constructor
     * @param scheduledExecutorService The scheduled executor service
     */
    AsyncInterceptor(BeanLocator beanLocator, @Named(TaskExecutors.SCHEDULED) Optional> scheduledExecutorService) {
        this.beanLocator = beanLocator;
        this.scheduledExecutorService = scheduledExecutorService;
    }

    @Override
    public int getOrder() {
        return InterceptPhase.ASYNC.getPosition();
    }

    @Override
    public Object intercept(MethodInvocationContext context) {
        String executorServiceName = context.stringValue(Async.class).orElse(TaskExecutors.SCHEDULED);
        ExecutorService executorService;
        if (TaskExecutors.SCHEDULED.equals(executorServiceName) && scheduledExecutorService.isPresent()) {
            executorService = scheduledExecutorService.get().get();
        } else {
            executorService = scheduledExecutorServices.computeIfAbsent(executorServiceName, name ->
                    beanLocator.findBean(ExecutorService.class, Qualifiers.byName(name))
                            .orElseThrow(() -> new TaskExecutionException("No ExecutorService named [" + name + "] configured in application context")));
        }

        ReturnType