org.neo4j.driver.internal.cursor.DisposableAsyncResultCursor Maven / Gradle / Ivy

/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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.cursor;

import static org.neo4j.driver.internal.util.ErrorUtil.newResultConsumedError;
import static org.neo4j.driver.internal.util.Futures.completedWithNull;
import static org.neo4j.driver.internal.util.Futures.failedFuture;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.function.Consumer;
import java.util.function.Function;
import org.neo4j.driver.Record;
import org.neo4j.driver.summary.ResultSummary;

public class DisposableAsyncResultCursor implements AsyncResultCursor {
    private final AsyncResultCursor delegate;
    private boolean isDisposed;

    public DisposableAsyncResultCursor(AsyncResultCursor delegate) {
        this.delegate = delegate;
    }

    @Override
    public List keys() {
        return delegate.keys();
    }

    @Override
    public CompletionStage consumeAsync() {
        isDisposed = true;
        return delegate.consumeAsync();
    }

    @Override
    public CompletionStage nextAsync() {
        return assertNotDisposed().thenCompose(ignored -> delegate.nextAsync());
    }

    @Override
    public CompletionStage peekAsync() {
        return assertNotDisposed().thenCompose(ignored -> delegate.peekAsync());
    }

    @Override
    public CompletionStage singleAsync() {
        return assertNotDisposed().thenCompose(ignored -> delegate.singleAsync());
    }

    @Override
    public CompletionStage forEachAsync(Consumer action) {
        return assertNotDisposed().thenCompose(ignored -> delegate.forEachAsync(action));
    }

    @Override
    public CompletionStage> listAsync() {
        return assertNotDisposed().thenCompose(ignored -> delegate.listAsync());
    }

    @Override
    public  CompletionStage> listAsync(Function mapFunction) {
        return assertNotDisposed().thenCompose(ignored -> delegate.listAsync(mapFunction));
    }

    @Override
    public CompletionStage isOpenAsync() {
        return CompletableFuture.completedFuture(!isDisposed());
    }

    @Override
    public CompletionStage discardAllFailureAsync() {
        isDisposed = true;
        return delegate.discardAllFailureAsync();
    }

    @Override
    public CompletionStage pullAllFailureAsync() {
        // This one does not dispose the result so that a user could still visit the buffered result after this method
        // call.
        // This also does not assert not disposed so that this method can be called after summary.
        return delegate.pullAllFailureAsync();
    }

    private  CompletableFuture assertNotDisposed() {
        if (isDisposed) {
            return failedFuture(newResultConsumedError());
        }
        return completedWithNull();
    }

    boolean isDisposed() {
        return this.isDisposed;
    }

    @Override
    public CompletableFuture mapSuccessfulRunCompletionAsync() {
        return this.delegate.mapSuccessfulRunCompletionAsync().thenApply(ignored -> this);
    }
}