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/*
 * Copyright 2012 International Business Machines Corp.
 * 
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. 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 com.ibm.jbatch.container.impl;

import java.io.Serializable;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.logging.Logger;


import com.ibm.jbatch.container.IController;
import com.ibm.jbatch.container.artifact.proxy.InjectionReferences;
import com.ibm.jbatch.container.artifact.proxy.PartitionCollectorProxy;
import com.ibm.jbatch.container.artifact.proxy.ProxyFactory;
import com.ibm.jbatch.container.artifact.proxy.StepListenerProxy;
import com.ibm.jbatch.container.context.impl.StepContextImpl;
import com.ibm.jbatch.container.exception.BatchContainerServiceException;
import com.ibm.jbatch.container.jobinstance.RuntimeJobExecution;
import com.ibm.jbatch.container.util.PartitionDataWrapper;
import com.ibm.jbatch.container.util.PartitionDataWrapper.PartitionEventType;
import com.ibm.jbatch.container.validation.ArtifactValidationException;
import com.ibm.jbatch.jsl.model.Collector;
import com.ibm.jbatch.jsl.model.Property;
import com.ibm.jbatch.jsl.model.Step;

/**
 * 
 * When a partitioned step is run, this controller will only be used for the partition threads, 
 * NOT the top-level main thread that the step executes upon.
 * 
 * When a non-partitioned step is run this controller will be used as well (and there will be no
 * separate main thread with controller).
 *
 */
public abstract class SingleThreadedStepControllerImpl extends BaseStepControllerImpl implements IController {

	private final static String sourceClass = SingleThreadedStepControllerImpl.class.getName();
	private final static Logger logger = Logger.getLogger(sourceClass);

	// Collector only used from partition threads, not main thread
	protected PartitionCollectorProxy collectorProxy = null;

	protected SingleThreadedStepControllerImpl(RuntimeJobExecution jobExecutionImpl, Step step, StepContextImpl stepContext, long rootJobExecutionId, BlockingQueue analyzerStatusQueue) {
		super(jobExecutionImpl, step, stepContext, rootJobExecutionId, analyzerStatusQueue);
	}

	List stepListeners = null;

	protected void setupStepArtifacts() {
		// set up listeners

		InjectionReferences injectionRef = new InjectionReferences(jobExecutionImpl.getJobContext(), stepContext, null);
		this.stepListeners = jobExecutionImpl.getListenerFactory().getStepListeners(step, injectionRef, stepContext);

		// set up collectors if we are running a partitioned step
		if (step.getPartition() != null) {
			Collector collector = step.getPartition().getCollector();
			if (collector != null) {
				List propList = (collector.getProperties() == null) ? null : collector.getProperties().getPropertyList();
				/**
				 * Inject job flow, split, and step contexts into partition
				 * artifacts like collectors and listeners some of these
				 * contexts may be null
				 */
				injectionRef = new InjectionReferences(jobExecutionImpl.getJobContext(), stepContext, propList);

				try {
					this.collectorProxy = ProxyFactory.createPartitionCollectorProxy(collector.getRef(), injectionRef, this.stepContext);
				} catch (ArtifactValidationException e) {
					throw new BatchContainerServiceException("Cannot create the collector [" + collector.getRef() + "]", e);
				}
			}
		}
	}

	@Override
	protected void invokePreStepArtifacts() {
		// Don't call beforeStep() in the partitioned case, since we are now on a partition thread, and
		// have already called beforeStep() on the main thread as the spec says.
		if ((stepListeners != null) && (this.jobExecutionImpl.getPartitionInstance() == null)) {
			for (StepListenerProxy listenerProxy : stepListeners) {
				listenerProxy.beforeStep();
			}
		}
	}

	@Override
	protected void invokePostStepArtifacts() {
		// Don't call beforeStep() in the partitioned case, since we are now on a partition thread, and
		// have already called beforeStep() on the main thread as the spec says.
		if ((stepListeners != null) && (this.jobExecutionImpl.getPartitionInstance() == null)) {
			for (StepListenerProxy listenerProxy : stepListeners) {
				listenerProxy.afterStep();
			}
		}
	}

	protected void invokeCollectorIfPresent() {
		if (collectorProxy != null) {
			Serializable data = collectorProxy.collectPartitionData();
			logger.finer("Got partition data: " + data + ", from collector: " + collectorProxy);
			sendCollectorDataToAnalyzerIfPresent(data);
		} 
	}
	
	// Useless to have collector without analyzer but let's check so we don't hang or blow up.
	protected void sendCollectorDataToAnalyzerIfPresent(Serializable data) {
		if (analyzerStatusQueue != null) {
			logger.finer("Sending collector partition data: " + data + " to analyzer queue: " + analyzerStatusQueue);
			PartitionDataWrapper dataWrapper = new PartitionDataWrapper();
			dataWrapper.setCollectorData(data);
			dataWrapper.setEventType(PartitionEventType.ANALYZE_COLLECTOR_DATA);
			analyzerStatusQueue.add(dataWrapper);
		} else {
			logger.fine("Analyzer not configured.");
		}
	}

	// Useless to have collector without analyzer but let's check so we don't hang or blow up.
	@Override
	protected void sendStatusFromPartitionToAnalyzerIfPresent() {
		if (analyzerStatusQueue != null) {
			logger.fine("Send status from partition for analyzeStatus with batchStatus = " + stepStatus.getBatchStatus() + ", exitStatus = " + stepStatus.getExitStatus());
			PartitionDataWrapper dataWrapper = new PartitionDataWrapper();
			dataWrapper.setBatchStatus(stepStatus.getBatchStatus());
			dataWrapper.setExitStatus(stepStatus.getExitStatus());
			dataWrapper.setEventType(PartitionEventType.ANALYZE_STATUS);
			analyzerStatusQueue.add(dataWrapper);
		} else {
			logger.fine("Analyzer not configured.");
		}
	}
}