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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onosproject.net.intent.impl.phase;
import java.util.Optional;
import java.util.concurrent.Callable;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Worker to process a submitted intent. {@link #call()} method generates
*/
public final class IntentWorker implements Callable<FinalIntentProcessPhase> {
private final IntentProcessPhase initial;
/**
* Create an instance with the specified arguments.
*
* @param initial initial intent process phase
*/
public IntentWorker(IntentProcessPhase initial) {
this.initial = checkNotNull(initial);
}
@Override
public FinalIntentProcessPhase call() throws Exception {
IntentProcessPhase update = initial;
Optional<IntentProcessPhase> currentPhase = Optional.of(update);
IntentProcessPhase previousPhase = update;
while (currentPhase.isPresent()) {
previousPhase = currentPhase.get();
currentPhase = previousPhase.execute();
}
return (FinalIntentProcessPhase) previousPhase;
}
}
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