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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 io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.propagation.PropagatedContext;
import io.micronaut.core.util.ArgumentUtils;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.runtime.DeleteBatchOperation;
import io.micronaut.data.model.runtime.DeleteOperation;
import io.micronaut.data.model.runtime.InsertBatchOperation;
import io.micronaut.data.model.runtime.InsertOperation;
import io.micronaut.data.model.runtime.PagedQuery;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.model.runtime.UpdateBatchOperation;
import io.micronaut.data.model.runtime.UpdateOperation;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.operations.async.AsyncRepositoryOperations;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.Executor;
import java.util.function.Supplier;

/**
 * An implementation of {@link AsyncRepositoryOperations} that delegates to a blocking operations and specified {@link Executor}.
 * This can be used in absence of true asynchronous support at the driver level.
 *
 * If a backing implementation provides a async API then the backing implementation should not use this class and instead directly implement the {@link AsyncRepositoryOperations} interface.
 *
 * @author graemerocher
 * @since 1.0.0
 */
public class ExecutorAsyncOperations implements AsyncRepositoryOperations {

    private final RepositoryOperations datastore;
    private final Executor executor;

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

    @Internal
    final  CompletableFuture supplyAsync(Supplier supplier) {
        CompletableFuture cf = new CompletableFuture<>();
        PropagatedContext propagatedContext = PropagatedContext.getOrEmpty();
        CompletableFuture.supplyAsync(PropagatedContext.wrapCurrent(supplier), executor).whenComplete((value, throwable) -> {
            try (PropagatedContext.Scope ignore = propagatedContext.propagate()) {
                if (throwable != null) {
                    cf.completeExceptionally(throwable);
                } else {
                    cf.complete(value);
                }
            }
        });
        return cf;
    }

    @Override
    public Executor getExecutor() {
        return executor;
    }

    @NonNull
    @Override
    public  CompletableFuture findOne(@NonNull Class type, @NonNull Object id) {
        return supplyAsync(() -> datastore.findOne(type, id)
        );
    }

    @Override
    public  CompletableFuture exists(@NonNull PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.exists(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletableFuture findOne(@NonNull PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.findOne(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletableFuture findOptional(@NonNull Class type, @NonNull Object id) {
        return supplyAsync(() -> datastore.findOne(type, id));
    }

    @NonNull
    @Override
    public  CompletableFuture findOptional(@NonNull PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.findOne(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletableFuture> findAll(@NonNull PagedQuery pagedQuery) {
        return supplyAsync(() -> datastore.findAll(pagedQuery));
    }

    @Override
    public  CompletableFuture count(@NonNull PagedQuery pagedQuery) {
        return supplyAsync(() -> datastore.count(pagedQuery));
    }

    @NonNull
    @Override
    public  CompletableFuture> findAll(@NonNull PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.findAll(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletableFuture persist(@NonNull InsertOperation entity) {
        return supplyAsync(() -> datastore.persist(entity));
    }

    @NonNull
    @Override
    public  CompletableFuture update(@NonNull UpdateOperation operation) {
        return supplyAsync(() -> datastore.update(operation));
    }

    @NonNull
    @Override
    public  CompletableFuture> updateAll(@NonNull UpdateBatchOperation operation) {
        return supplyAsync(() -> datastore.updateAll(operation));
    }

    @NonNull
    @Override
    public  CompletableFuture delete(@NonNull DeleteOperation operation) {
        return supplyAsync(() -> datastore.delete(operation));
    }

    @NonNull
    @Override
    public  CompletableFuture> persistAll(@NonNull InsertBatchOperation operation) {
        return supplyAsync(() -> datastore.persistAll(operation));
    }

    @NonNull
    @Override
    public CompletableFuture executeUpdate(@NonNull PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.executeUpdate(preparedQuery).orElse(0));
    }

    @Override
    public CompletionStage executeDelete(PreparedQuery preparedQuery) {
        return supplyAsync(() -> datastore.executeDelete(preparedQuery).orElse(0));
    }

    @NonNull
    @Override
    public  CompletableFuture deleteAll(@NonNull DeleteBatchOperation operation) {
        return supplyAsync(() -> datastore.deleteAll(operation).orElse(0));
    }

    @Override
    public  CompletableFuture> findPage(@NonNull PagedQuery pagedQuery) {
        return supplyAsync(() -> datastore.findPage(pagedQuery));
    }
}