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Data Repository Support for Micronaut
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/*
 * Copyright 2017-2021 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.NonNull;
import io.micronaut.core.async.propagation.ReactorPropagation;
import io.micronaut.core.propagation.PropagatedContext;
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.async.AsyncRepositoryOperations;
import io.micronaut.data.operations.reactive.ReactiveRepositoryOperations;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.util.concurrent.CompletionStage;
import java.util.concurrent.Executor;

/**
 * An implementation of {@link AsyncRepositoryOperations} that delegates to a reactive operation.
 *
 * @author Denis Stepanov
 * @since 2.4.0
 */
public class AsyncFromReactiveAsyncRepositoryOperation implements AsyncRepositoryOperations {

    private final ReactiveRepositoryOperations reactiveOperations;
    private final Executor executor;

    public AsyncFromReactiveAsyncRepositoryOperation(ReactiveRepositoryOperations reactiveOperations,
                                                     Executor executor) {
        this.reactiveOperations = reactiveOperations;
        this.executor = executor;
    }

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

    @NonNull
    @Override
    public  CompletionStage findOne(@NonNull Class type, @NonNull Object id) {
        return toCompletionStage(reactiveOperations.findOne(type, id));
    }

    @Override
    public  CompletionStage exists(@NonNull PreparedQuery preparedQuery) {
        return toCompletionStage(reactiveOperations.exists(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage findOne(@NonNull PreparedQuery preparedQuery) {
        return toCompletionStage(reactiveOperations.findOne(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage findOptional(@NonNull Class type, @NonNull Object id) {
        return toCompletionStage(reactiveOperations.findOptional(type, id));
    }

    @NonNull
    @Override
    public  CompletionStage findOptional(@NonNull PreparedQuery preparedQuery) {
        return toCompletionStage(reactiveOperations.findOptional(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage> findAll(PagedQuery pagedQuery) {
        return toIterableCompletionStage(reactiveOperations.findAll(pagedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage count(PagedQuery pagedQuery) {
        return toCompletionStage(reactiveOperations.count(pagedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage> findAll(@NonNull PreparedQuery preparedQuery) {
        return toIterableCompletionStage(reactiveOperations.findAll(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage persist(@NonNull InsertOperation operation) {
        return toCompletionStage(reactiveOperations.persist(operation));
    }

    @NonNull
    @Override
    public  CompletionStage update(@NonNull UpdateOperation operation) {
        return toCompletionStage(reactiveOperations.update(operation));
    }

    @NonNull
    @Override
    public  CompletionStage delete(@NonNull DeleteOperation operation) {
        return toCompletionStage(reactiveOperations.delete(operation));
    }

    @NonNull
    @Override
    public  CompletionStage> persistAll(@NonNull InsertBatchOperation operation) {
        return toIterableCompletionStage(reactiveOperations.persistAll(operation));
    }

    @NonNull
    @Override
    public CompletionStage executeUpdate(@NonNull PreparedQuery preparedQuery) {
        return toCompletionStage(reactiveOperations.executeUpdate(preparedQuery));
    }

    @Override
    public CompletionStage executeDelete(PreparedQuery preparedQuery) {
        return toCompletionStage(reactiveOperations.executeDelete(preparedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage deleteAll(@NonNull DeleteBatchOperation operation) {
        return toCompletionStage(reactiveOperations.deleteAll(operation));
    }

    @NonNull
    @Override
    public  CompletionStage> findPage(@NonNull PagedQuery pagedQuery) {
        return toCompletionStage(reactiveOperations.findPage(pagedQuery));
    }

    @NonNull
    @Override
    public  CompletionStage> updateAll(@NonNull UpdateBatchOperation operation) {
        return toIterableCompletionStage(reactiveOperations.updateAll(operation));
    }

    private  CompletionStage> toIterableCompletionStage(Publisher publisher) {
        return Flux.from(publisher)
            .contextWrite(ctx -> ReactorPropagation.addPropagatedContext(ctx, PropagatedContext.getOrEmpty()))
            .collectList()
            .map(v -> (Iterable) v)
            .toFuture();
    }

    private  CompletionStage toCompletionStage(Publisher publisher) {
        return Mono.from(publisher)
            .contextWrite(ctx -> ReactorPropagation.addPropagatedContext(ctx, PropagatedContext.getOrEmpty()))
            .toFuture();
    }

}