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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============================LICENSE_END===========================================
*/
package org.openecomp.dcae.apod.analytics.common.service.processor;
import org.openecomp.dcae.apod.analytics.common.utils.MessageProcessorUtils.MessageProcessorFunction;
import java.util.List;
import static org.openecomp.dcae.apod.analytics.common.utils.MessageProcessorUtils.computeMessageProcessorChain;
/**
* <p>
* A Generic Message Processor which passes the {@link ProcessorContext} from first to second
* {@link MessageProcessor}
* </p>
*
* @param <P> Processor Context sub classes
*
* @author Rajiv Singla . Creation Date: 11/8/2016.
*/
public class GenericMessageChainProcessor<P extends ProcessorContext> {
private final List<? extends MessageProcessor<P>> messageProcessors;
private final P initialProcessorContext;
public GenericMessageChainProcessor(List<? extends MessageProcessor<P>> messageProcessors,
P initialProcessorContext) {
this.messageProcessors = messageProcessors;
this.initialProcessorContext = initialProcessorContext;
}
/**
* Process a processor chain
*
* @return Processor Context after processing the processor chain
*/
public P processChain() {
final MessageProcessorFunction<P> messageProcessorFunction =
new MessageProcessorFunction<P>() {
@Override
public <M extends MessageProcessor<P>> P apply(P context, M processor) {
return processor.apply(context);
}
};
return computeMessageProcessorChain(messageProcessors, initialProcessorContext,
messageProcessorFunction);
}
}
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