io.r2dbc.postgresql.client.SimpleQueryMessageFlow Maven / Gradle / Ivy

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/*
 * Copyright 2017 the original author or 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.r2dbc.postgresql.client;

import io.netty.util.ReferenceCountUtil;
import io.netty.util.ReferenceCounted;
import io.r2dbc.postgresql.message.backend.BackendMessage;
import io.r2dbc.postgresql.message.frontend.FrontendMessage;
import io.r2dbc.postgresql.message.frontend.Query;
import io.r2dbc.postgresql.util.Assert;
import io.r2dbc.postgresql.util.Operators;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

/**
 * A utility class that encapsulates the Simple Query message flow.
 */
public final class SimpleQueryMessageFlow {

    private SimpleQueryMessageFlow() {
    }

    /**
     * Execute the Simple Query message flow.
     *
     * @param client the {@link Client} to exchange messages with
     * @param query  the query to execute
     * @return the messages received in response to this exchange
     * @throws IllegalArgumentException if {@code client} or {@code query} is {@code null}
     */
    public static Flux exchange(Client client, String query) {
        Assert.requireNonNull(client, "client must not be null");
        Assert.requireNonNull(query, "query must not be null");

        return client.exchange(Mono.just(new Query(query)).doOnSubscribe(ignore -> QueryLogger.logQuery(client.getContext(), query))).doOnDiscard(ReferenceCounted.class,
            ReferenceCountUtil::release).as(Operators::discardOnCancel);
    }

}