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Data Repository Support for Micronaut
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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.data.runtime.operations;

import edu.umd.cs.findbugs.annotations.NonNull;
import io.micronaut.core.async.publisher.Publishers;
import io.micronaut.core.util.ArgumentUtils;
import io.micronaut.data.model.runtime.*;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.operations.reactive.ReactiveRepositoryOperations;
import io.micronaut.data.model.Page;
import io.reactivex.Flowable;
import org.reactivestreams.Publisher;

import java.io.Serializable;
import java.util.concurrent.Executor;

/**
 * An implementation of {@link ReactiveRepositoryOperations} that delegates to a blocking operations and specified {@link Executor}.
 * This can be used in absence of true reactive support at the driver level an allows composing blocking operations within reactive flows.
 *
 * If a backing implementation provides a reactive API then the backing implementation should not use this class and instead directly implement the {@link ReactiveRepositoryOperations} interface.
 *
 * @see ReactiveRepositoryOperations
 * @author graemerocher
 * @since 1.0.0
 */
public class ExecutorReactiveOperations implements ReactiveRepositoryOperations {

    private final ExecutorAsyncOperations asyncOperations;

    /**
     * Default constructor.
     *
     * @param datastore The target operations
     * @param executor  The executor to use.
     */
    public ExecutorReactiveOperations(@NonNull RepositoryOperations datastore, @NonNull Executor executor) {
        this(new ExecutorAsyncOperations(datastore, executor));
    }

    /**
     * Default constructor.
     *
     * @param asyncOperations The instance operations instance
     */
    public ExecutorReactiveOperations(@NonNull ExecutorAsyncOperations asyncOperations) {
        ArgumentUtils.requireNonNull("asyncOperations", asyncOperations);
        this.asyncOperations = asyncOperations;
    }

    @NonNull
    @Override
    public  Publisher findOne(@NonNull Class type, @NonNull Serializable id) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.findOne(type, id)
        );
    }

    @Override
    public  Publisher exists(@NonNull PreparedQuery preparedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.exists(preparedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher findOne(@NonNull PreparedQuery preparedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.findOne(preparedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher findOptional(@NonNull Class type, @NonNull Serializable id) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.findOptional(type, id)
        );
    }

    @NonNull
    @Override
    public  Publisher findOptional(@NonNull PreparedQuery preparedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.findOptional(preparedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher findAll(PagedQuery pagedQuery) {
        return Flowable.fromPublisher(Publishers.fromCompletableFuture(() ->
                asyncOperations.findAll(pagedQuery)
        )).flatMap(Flowable::fromIterable);
    }

    @NonNull
    @Override
    public  Publisher count(PagedQuery pagedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.count(pagedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher> findPage(@NonNull PagedQuery pagedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.findPage(pagedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher findAll(@NonNull PreparedQuery preparedQuery) {
        return Flowable.fromPublisher(Publishers.fromCompletableFuture(() ->
                asyncOperations.findAll(preparedQuery)
        )).flatMap(Flowable::fromIterable);
    }

    @NonNull
    @Override
    public  Publisher persist(@NonNull InsertOperation entity) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.persist(entity)
        );
    }

    @NonNull
    @Override
    public  Publisher update(@NonNull UpdateOperation operation) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.update(operation)
        );
    }

    @NonNull
    @Override
    public  Publisher persistAll(@NonNull BatchOperation operation) {
        return Flowable.fromPublisher(Publishers.fromCompletableFuture(() ->
                asyncOperations.persistAll(operation)
        )).flatMap(Flowable::fromIterable);
    }

    @NonNull
    @Override
    public Publisher executeUpdate(@NonNull PreparedQuery preparedQuery) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.executeUpdate(preparedQuery)
        );
    }

    @NonNull
    @Override
    public  Publisher deleteAll(BatchOperation operation) {
        return Publishers.fromCompletableFuture(() ->
                asyncOperations.deleteAll(operation)
        );
    }
}