/*
* 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.jclouds.rest.internal;
import static com.google.common.base.Throwables.propagate;
import static com.google.common.util.concurrent.Futures.getUnchecked;
import java.lang.reflect.InvocationTargetException;
import javax.annotation.Resource;
import javax.inject.Inject;
import org.jclouds.logging.Logger;
import org.jclouds.reflect.Invocation;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.reflect.Invokable;
import com.google.common.util.concurrent.ListenableFuture;
/**
*
* @author Adrian Cole
* @deprecated will be removed in jclouds 1.7, as async interfaces are no longer supported.
*/
@Deprecated
public final class InvokeAndCallGetOnFutures<R> implements Function<Invocation, Object> {
@Resource
private Logger logger = Logger.NULL;
private final Function<Invocation, Invocation> sync2async;
private final R receiver;
/**
* @param receiver
* will have any methods that return {@link ListenableFuture} unwrapped.
* @return blocking invocation handler
*/
@Inject
@VisibleForTesting
InvokeAndCallGetOnFutures(Function<Invocation, Invocation> sync2async, R receiver) {
this.sync2async = sync2async;
this.receiver = receiver;
}
@SuppressWarnings("unchecked")
@Override
public Object apply(Invocation in) {
@SuppressWarnings("rawtypes")
Invokable target = sync2async.apply(in).getInvokable();
Object returnVal;
try {
returnVal = target.invoke(receiver, in.getArgs().toArray());
} catch (InvocationTargetException e) {
throw propagate(e.getCause());
} catch (IllegalAccessException e) {
throw new Error("Method became inaccessible: " + toString(), e);
}
if (!isFuture(target))
return returnVal;
return getUnchecked(ListenableFuture.class.cast(returnVal));
}
private boolean isFuture(Invokable<?, ?> target) {
return target.getReturnType().getRawType().isAssignableFrom(ListenableFuture.class);
}
@Override
public String toString() {
return String.format("InvokeAndCallGetOnFutures(%s)", receiver);
}
}