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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cassandra.utils.concurrent;
import java.util.concurrent.Executor;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import com.google.common.util.concurrent.AsyncFunction;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.ListenableFuture; // checkstyle: permit this import
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.internal.PlatformDependent;
import org.apache.cassandra.utils.Shared;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.apache.cassandra.utils.Shared.Recursive.INTERFACES;
import static org.apache.cassandra.utils.Shared.Scope.SIMULATION;
/**
* A Future that integrates several different (but equivalent) APIs used within Cassandra into a single concept,
* integrating also with our {@link Awaitable} abstraction, to overall improve coherency and clarity in the codebase.
*/
@Shared(scope = SIMULATION, ancestors = INTERFACES)
public interface Future extends io.netty.util.concurrent.Future, ListenableFuture, Awaitable
{
/**
* Wait indefinitely for this future to complete, throwing any interrupt
* @throws InterruptedException if interrupted
*/
@Override
Future await() throws InterruptedException;
/**
* Wait indefinitely for this future to complete
*/
@Override
Future awaitUninterruptibly();
/**
* Wait indefinitely for this promise to complete, throwing any interrupt as an UncheckedInterruptedException
* @throws UncheckedInterruptedException if interrupted
*/
@Override
Future awaitThrowUncheckedOnInterrupt();
default void rethrowIfFailed()
{
Throwable cause = this.cause();
if (cause != null)
{
PlatformDependent.throwException(cause);
}
}
/**
* waits for completion; in case of failure rethrows the original exception without a new wrapping exception
* so may cause problems for reporting stack traces
*/
@Override
default Future sync() throws InterruptedException
{
await();
rethrowIfFailed();
return this;
}
/**
* waits for completion; in case of failure rethrows the original exception without a new wrapping exception
* so may cause problems for reporting stack traces
*/
@Override
default Future syncUninterruptibly()
{
awaitUninterruptibly();
rethrowIfFailed();
return this;
}
/**
* waits for completion; in case of failure rethrows the original exception without a new wrapping exception
* so may cause problems for reporting stack traces
*/
default Future syncThrowUncheckedOnInterrupt()
{
awaitThrowUncheckedOnInterrupt();
rethrowIfFailed();
return this;
}
/** @deprecated See CASSANDRA-16924 */
@Deprecated(since = "4.1")
@Override
default boolean await(long l) throws InterruptedException
{
return await(l, MILLISECONDS);
}
/** @deprecated See CASSANDRA-16924 */
@Deprecated(since = "4.1")
@Override
default boolean awaitUninterruptibly(long l)
{
return awaitUninterruptibly(l, MILLISECONDS);
}
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(BiConsumer callback);
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(BiConsumer callback, Executor executor);
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(FutureCallback callback);
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(FutureCallback callback, Executor executor);
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(Consumer onSuccess, Consumer onFailure);
/**
* Support {@link com.google.common.util.concurrent.Futures#addCallback} natively
*/
Future addCallback(Consumer onSuccess, Consumer onFailure, Executor executor);
/**
* Support {@link com.google.common.util.concurrent.Futures#transform(ListenableFuture, com.google.common.base.Function, Executor)} natively
*/
default Future map(Function mapper)
{
return map(mapper, null);
}
/**
* Support {@link com.google.common.util.concurrent.Futures#transform(ListenableFuture, com.google.common.base.Function, Executor)} natively
*/
Future map(Function mapper, Executor executor);
/**
* Support {@link com.google.common.util.concurrent.Futures#transformAsync(ListenableFuture, AsyncFunction, Executor)} natively
*/
default Future flatMap(Function> flatMapper)
{
return flatMap(flatMapper, null);
}
/**
* Support {@link com.google.common.util.concurrent.Futures#transformAsync(ListenableFuture, AsyncFunction, Executor)} natively
*/
Future flatMap(Function> flatMapper, Executor executor);
/**
* Invoke {@code runnable} on completion, using {@code executor}.
*
* Tasks are submitted to their executors in the order they were added to this Future.
*/
@Override
void addListener(Runnable runnable, Executor executor);
/**
* Invoke {@code runnable} on completion. Depending on the implementation and its configuration, this
* may be executed immediately by the notifying/completing thread, or asynchronously by an executor.
* Tasks are executed, or submitted to the executor, in the order they were added to this Future.
*/
void addListener(Runnable runnable);
Executor notifyExecutor();
@Override Future addListener(GenericFutureListener> genericFutureListener);
@Override Future addListeners(GenericFutureListener>... genericFutureListeners);
@Override Future removeListener(GenericFutureListener> genericFutureListener);
@Override Future removeListeners(GenericFutureListener>... genericFutureListeners);
}