/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* 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 com.datastax.driver.core.utils;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
/**
* Helpers to work with Guava's {@link ListenableFuture}.
*/
public class MoreFutures {
/**
* An immediate successful {@code ListenableFuture<Void>}.
*/
public static final ListenableFuture<Void> VOID_SUCCESS = Futures.immediateFuture(null);
/**
* A {@link FutureCallback} that does nothing on failure.
*/
public static abstract class SuccessCallback<V> implements FutureCallback<V> {
@Override
public void onFailure(Throwable t) { /* nothing */ }
}
/**
* A {@link FutureCallback} that does nothing on success.
*/
public static abstract class FailureCallback<V> implements FutureCallback<V> {
@Override
public void onSuccess(V result) { /* nothing */ }
}
}