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Data Repository Support for Micronaut
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/*
 * Copyright 2017-2022 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.data.mongodb.database;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.context.ApplicationContext;
import io.micronaut.context.annotation.EachBean;
import io.micronaut.context.annotation.Factory;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.model.runtime.StoredQuery;
import io.micronaut.data.mongodb.conf.RequiresReactiveMongo;
import io.micronaut.data.mongodb.operations.DefaultReactiveMongoRepositoryOperations;
import io.micronaut.data.mongodb.operations.MongoRepositoryOperations;
import io.micronaut.data.operations.HintsCapableRepository;
import io.micronaut.data.operations.async.AsyncCapableRepository;
import io.micronaut.data.operations.reactive.BlockingReactorRepositoryOperations;
import io.micronaut.data.operations.reactive.ReactorReactiveRepositoryOperations;
import io.micronaut.data.runtime.operations.ExecutorAsyncOperations;
import io.micronaut.data.runtime.query.MethodContextAwareStoredQueryDecorator;
import io.micronaut.data.runtime.query.PreparedQueryDecorator;
import jakarta.inject.Singleton;

import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * MongoDB reactive beans factory.
 */
@RequiresReactiveMongo
@Internal
@Factory
final class MongoReactiveFactory {

    @EachBean(DefaultReactiveMongoRepositoryOperations.class)
    @Singleton
    MongoRepositoryOperations syncOperations(DefaultReactiveMongoRepositoryOperations reactiveOperations) {
        return new MongoReactiveBlockingRepositoryOperations(reactiveOperations);
    }

    private static final class MongoReactiveBlockingRepositoryOperations implements
            MongoRepositoryOperations,
            BlockingReactorRepositoryOperations,
            AsyncCapableRepository,
            HintsCapableRepository,
            MethodContextAwareStoredQueryDecorator,
            PreparedQueryDecorator {

        private final DefaultReactiveMongoRepositoryOperations reactiveOperations;
        private ExecutorService executorService;
        private ExecutorAsyncOperations asyncOperations;

        private MongoReactiveBlockingRepositoryOperations(DefaultReactiveMongoRepositoryOperations reactiveOperations) {
            this.reactiveOperations = reactiveOperations;
        }

        @Override
        public ConversionService getConversionService() {
            return reactiveOperations.getConversionService();
        }

        @Override
        public Map getQueryHints(StoredQuery storedQuery) {
            return reactiveOperations.getQueryHints(storedQuery);
        }

        @Override
        public ReactorReactiveRepositoryOperations reactive() {
            return reactiveOperations;
        }

        @Override
        public ApplicationContext getApplicationContext() {
            return reactiveOperations.getApplicationContext();
        }

        @NonNull
        @Override
        public ExecutorAsyncOperations async() {
            ExecutorAsyncOperations asyncOperations = this.asyncOperations;
            if (asyncOperations == null) {
                synchronized (this) { // double check
                    asyncOperations = this.asyncOperations;
                    if (asyncOperations == null) {
                        if (executorService == null) {
                            executorService = Executors.newCachedThreadPool();
                        }
                        asyncOperations = new ExecutorAsyncOperations(this, executorService);
                        this.asyncOperations = asyncOperations;
                    }
                }
            }
            return asyncOperations;
        }

        @Override
        public  StoredQuery decorate(MethodInvocationContext context, StoredQuery storedQuery) {
            return reactiveOperations.decorate(context, storedQuery);
        }

        @Override
        public  PreparedQuery decorate(PreparedQuery preparedQuery) {
            return reactiveOperations.decorate(preparedQuery);
        }

    }

}