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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.concurrent;
import java.util.concurrent.Callable;
import javax.annotation.Nullable;
import org.apache.cassandra.utils.concurrent.AsyncFuture;
import org.apache.cassandra.utils.concurrent.RunnableFuture;
/**
* A FutureTask that utilises Cassandra's {@link AsyncFuture}, making it compatible with {@link ExecutorPlus}.
* Propagates exceptions to the uncaught exception handler.
*/
public class FutureTask extends AsyncFuture implements RunnableFuture
{
private Callable call;
private volatile DebuggableTask debuggable;
public FutureTask(Callable call)
{
this(call, call instanceof DebuggableTask ? (DebuggableTask) call : null);
}
public FutureTask(Runnable run)
{
this(callable(run), run instanceof DebuggableTask ? (DebuggableTask) run : null);
}
private FutureTask(Callable call, DebuggableTask debuggable)
{
this.call = call;
this.debuggable = debuggable;
}
@Nullable
DebuggableTask debuggableTask()
{
return debuggable;
}
V call() throws Exception
{
return call.call();
}
public void run()
{
try
{
if (!setUncancellable())
return;
trySuccess(call());
}
catch (Throwable t)
{
tryFailure(t);
}
finally
{
call = null;
debuggable = null;
}
}
protected boolean tryFailure(Throwable t)
{
ExecutionFailure.handle(t);
return super.tryFailure(t);
}
public static Callable callable(Runnable run)
{
return new Callable()
{
public T call()
{
run.run();
return null;
}
public String toString()
{
return run.toString();
}
};
}
public static Callable callable(Object id, Runnable run)
{
return new Callable()
{
public T call()
{
run.run();
return null;
}
public String toString()
{
return id.toString();
}
};
}
public static Callable callable(Runnable run, T result)
{
return new Callable()
{
public T call()
{
run.run();
return result;
}
public String toString()
{
return run + "->" + result;
}
};
}
public static Callable callable(Object id, Runnable run, T result)
{
return new Callable()
{
public T call()
{
run.run();
return result;
}
public String toString()
{
return id.toString();
}
};
}
@Override
protected String description()
{
Object desc = call;
return desc == null ? null : call.toString();
}
}