com.datastax.driver.core.ChainedResultSetFuture Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dse-java-driver-core Show documentation

A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

There is a newer version: 2.4.0

Show newest version

/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.core;

import com.google.common.util.concurrent.AbstractFuture;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.Uninterruptibles;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * A {@code ResultSetFuture} that will complete when its source future completes.
 */
class ChainedResultSetFuture extends AbstractFuture implements ResultSetFuture {

    private volatile ResultSetFuture source;

    void setSource(ResultSetFuture source) {
        if (this.isCancelled())
            source.cancel(false);
        this.source = source;
        Futures.addCallback(source, new FutureCallback() {
            @Override
            public void onSuccess(ResultSet result) {
                ChainedResultSetFuture.this.set(result);
            }

            @Override
            public void onFailure(Throwable t) {
                ChainedResultSetFuture.this.setException(t);
            }
        });
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        return (source == null || source.cancel(mayInterruptIfRunning))
                && super.cancel(mayInterruptIfRunning);
    }

    @Override
    public ResultSet getUninterruptibly() {
        try {
            return Uninterruptibles.getUninterruptibly(this);
        } catch (ExecutionException e) {
            throw DriverThrowables.propagateCause(e);
        }
    }

    @Override
    public ResultSet getUninterruptibly(long timeout, TimeUnit unit) throws TimeoutException {
        try {
            return Uninterruptibles.getUninterruptibly(this, timeout, unit);
        } catch (ExecutionException e) {
            throw DriverThrowables.propagateCause(e);
        }
    }
}