/*
* Copyright 2016 the original author or authors.
*
* 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 org.springframework.cassandra.core;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.util.Assert;
import org.springframework.util.concurrent.FailureCallback;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
import org.springframework.util.concurrent.SettableListenableFuture;
import org.springframework.util.concurrent.SuccessCallback;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
/**
* Adapter class to adapt Guava's {@link com.google.common.util.concurrent.ListenableFuture} into a Spring
* {@link ListenableFuture}.
*
* @author Mark Paluch
* @since 2.0
*/
public class GuavaListenableFutureAdapter<T> implements ListenableFuture<T> {
private final com.google.common.util.concurrent.ListenableFuture<T> adaptee;
private final ListenableFuture<T> future;
/**
* Create a new {@link GuavaListenableFutureAdapter} given a Guava
* {@link com.google.common.util.concurrent.ListenableFuture} and a {@link PersistenceExceptionTranslator}.
*
* @param adaptee must not be {@literal null}.
* @param persistenceExceptionTranslator must not be {@literal null}.
*/
public GuavaListenableFutureAdapter(com.google.common.util.concurrent.ListenableFuture<T> adaptee,
PersistenceExceptionTranslator persistenceExceptionTranslator) {
Assert.notNull(adaptee, "ListenableFuture must not be null");
Assert.notNull(persistenceExceptionTranslator, "PersistenceExceptionTranslator must not be null");
this.adaptee = adaptee;
this.future = adaptListenableFuture(adaptee, persistenceExceptionTranslator);
}
private static <T> ListenableFuture<T> adaptListenableFuture(
com.google.common.util.concurrent.ListenableFuture<T> guavaFuture,
PersistenceExceptionTranslator exceptionTranslator) {
SettableListenableFuture<T> settableFuture = new SettableListenableFuture<>();
Futures.addCallback(guavaFuture, new FutureCallback<T>() {
@Override
public void onSuccess(T result) {
settableFuture.set(result);
}
@Override
public void onFailure(Throwable t) {
if (t instanceof RuntimeException) {
DataAccessException dataAccessException = exceptionTranslator
.translateExceptionIfPossible((RuntimeException) t);
if (dataAccessException != null) {
settableFuture.setException(dataAccessException);
return;
}
}
settableFuture.setException(t);
}
});
return settableFuture;
}
/* (non-Javadoc)
* @see org.springframework.util.concurrent.ListenableFuture#addCallback(org.springframework.util.concurrent.ListenableFutureCallback)
*/
@Override
public void addCallback(ListenableFutureCallback<? super T> callback) {
future.addCallback(callback);
}
/* (non-Javadoc)
* @see org.springframework.util.concurrent.ListenableFuture#addCallback(org.springframework.util.concurrent.SuccessCallback, org.springframework.util.concurrent.FailureCallback)
*/
@Override
public void addCallback(SuccessCallback<? super T> successCallback, FailureCallback failureCallback) {
future.addCallback(successCallback, failureCallback);
}
/* (non-Javadoc)
* @see java.util.concurrent.Future#cancel(boolean)
*/
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return adaptee.cancel(mayInterruptIfRunning);
}
/* (non-Javadoc)
* @see java.util.concurrent.Future#isCancelled()
*/
@Override
public boolean isCancelled() {
return adaptee.isCancelled();
}
/* (non-Javadoc)
* @see java.util.concurrent.Future#isDone()
*/
@Override
public boolean isDone() {
return future.isDone();
}
/* (non-Javadoc)
* @see java.util.concurrent.Future#get()
*/
@Override
public T get() throws InterruptedException, ExecutionException {
return future.get();
}
/* (non-Javadoc)
* @see java.util.concurrent.Future#get(long, java.util.concurrent.TimeUnit)
*/
@Override
public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
return future.get(timeout, unit);
}
}