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

Go to download
/*
 * 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.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;
    GuavaCompatibility.INSTANCE.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);
    }
  }
}