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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * 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
 *
 *     http://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 org.neo4j.driver.internal.handlers;

import static org.neo4j.driver.internal.async.connection.ChannelAttributes.setLastUsedTimestamp;
import static org.neo4j.driver.internal.util.Futures.asCompletionStage;
import static org.neo4j.driver.internal.util.Futures.completedWithNull;

import io.netty.channel.Channel;
import java.time.Clock;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import org.neo4j.driver.internal.async.inbound.InboundMessageDispatcher;
import org.neo4j.driver.internal.async.pool.ExtendedChannelPool;

public class ChannelReleasingResetResponseHandler extends ResetResponseHandler {
    private final Channel channel;
    private final ExtendedChannelPool pool;
    private final Clock clock;

    public ChannelReleasingResetResponseHandler(
            Channel channel,
            ExtendedChannelPool pool,
            InboundMessageDispatcher messageDispatcher,
            Clock clock,
            CompletableFuture releaseFuture) {
        super(messageDispatcher, releaseFuture);
        this.channel = channel;
        this.pool = pool;
        this.clock = clock;
    }

    @Override
    protected void resetCompleted(CompletableFuture completionFuture, boolean success) {
        CompletionStage closureStage;
        if (success) {
            // update the last-used timestamp before returning the channel back to the pool
            setLastUsedTimestamp(channel, clock.millis());
            closureStage = completedWithNull();
        } else {
            // close the channel before returning it back to the pool if RESET failed
            closureStage = asCompletionStage(channel.close());
        }
        closureStage
                .exceptionally(throwable -> null)
                .thenCompose(ignored -> pool.release(channel))
                .whenComplete((ignore, error) -> completionFuture.complete(null));
    }
}