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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 com.google.common.base.Function;
import com.google.common.base.Optional;
import java.io.Serializable;
/**
* <p>
* A message processor can be used to process incoming messages.
* It uses implementations of {@link ProcessorContext} as input and output
* </p>
*
* @param <P> Message Processor Context implementations
*
* @author Rajiv Singla . Creation Date: 11/7/2016.
*/
public interface MessageProcessor<P extends ProcessorContext> extends Function<P, P>, Serializable {
/**
* Returns processor information
*
* @return processor Information
*/
ProcessorInfo getProcessorInfo();
/**
* Does pre-processing of {@link ProcessorContext} e.g. validate input conditions and return
* pre processed context
*
* @param processorContext incoming Processor Context
* @return Pre processed Processor Context
*/
P preProcessor(P processorContext);
/**
* Return processing state of a processor
*
* @return Processing State
*/
ProcessingState getProcessingState();
/**
* May return a message from a processor which indicates the reason for {@link ProcessingState} especially if
* there was some failure in processing
*
* @return processing Message
*/
Optional<String> getProcessingMessage();
/**
* Does post-processing of {@link ProcessorContext}
*
* @param processorContext incoming Processor Context
* @return processor Context after post processing is finished
*/
P postProcessor(P processorContext);
}
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