/*******************************************************************************
 *  Copyright 2017-2018 Centre for Development of Advanced Computing(C-DAC), Pune
 *  
 * 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 cdac.medinfo.sdk.dcm30_04.services.cservices.withoutdb.testcases.customizedscp;


import java.io.IOException;


import cdac.medinfo.sdk.dcm30_04.enums.EnumLoggingLevel;
import cdac.medinfo.sdk.dcm30_04.enums.EnumPDUType;

import cdac.medinfo.sdk.dcm30_04.services.association.AReleaseRQorRP;
import cdac.medinfo.sdk.dcm30_04.services.association.AssociateRQ;
import cdac.medinfo.sdk.dcm30_04.services.association.AssociationNegotiator;
import cdac.medinfo.sdk.dcm30_04.services.association.DefaultAssociation;
import cdac.medinfo.sdk.dcm30_04.services.association.IDIMSEAssociation;
import cdac.medinfo.sdk.dcm30_04.services.cecho.scp.CEchoSCP;
import cdac.medinfo.sdk.dcm30_04.services.dicomnetcommons.EnumServiceType;
import cdac.medinfo.sdk.dcm30_04.services.dimsecommons.DIMSEResponse;
import cdac.medinfo.sdk.dcm30_04.services.scp.commons.ClientSession;
import cdac.medinfo.sdk.dcm30_04.services.scp.commons.ProcessHandler;
import cdac.medinfo.sdk.dcm30_04.services.scp.commons.SCPSession;
import cdac.medinfo.sdk.dcm30_04.utils.DicomConfig;

/**
 * This class is to Test C-Echo SCP in Asynchronous Mode. In Asynchronous Mode SCU sends multiple service request
 * to SCP without waiting for the Response. The SCP processes the request and sends the response.
 * This is the customized implementation of the test code for C-Echo Services.
 * This sample codes is to show how user can define its own implementation for handling connection, association and service request in Asynchronous mode.
 * In this sample test code all the required methods of IProcessHandler are implemented (onConnect(), onAssociateReceive() and onServiceRequest()) 
 * and their definition is provided here. User can define these methods according to his need.
 */
public class CEcho_SCP_Async_Cust_ProcHandler
{
	public static void main(String[] args) throws Exception
	{
		DicomConfig objDicomConfig = DicomConfig.createInstance();

		//enable logging,specify the path of the directory where log files are created.
		//User can specify any directory in place of 'c:\DCM_Logs'.
		//If no directory is defined by user to create logs then it is created in User Temp DIR.
		objDicomConfig.enableLogging(EnumLoggingLevel.INFO, "C:\\DCM_Logs");

		/*
		 * Creates CEcho_SCP.
		 */
		AsyncCEchoSCPHandler scp = new AsyncCEchoSCPHandler();

		/*
		 * Creates SCP session and select Service which is handled by this SCP session. 
		 * Also set Process Handler on it.
		 */
		SCPSession session = new SCPSession();

		EnumServiceType []arrenumServiceType = new EnumServiceType[1];
		arrenumServiceType[0] = EnumServiceType.CECHO;
		session.selectServices(arrenumServiceType);

		//Set Process Handler as the SCP TestCode
		session.setIProcessHandler(scp);

		/*
		 * Setting time out as 5000 milli second. It will wait 5000 mili seconds for read and write operation.
		 * If in the time specified (5000 ms) read or write operation is not performed then 
		 * session is time out.
		 */ 
		//session.setTimeOut(5000);

		//Start the Session on IP and port specifed.
		session.start("SDK",9000);
	}
}

/**
 * This test code is to test  C-Echo Service in Asynchronous mode. In Asynchronous Mode SCU sends multiple service request
 * to SCP without waiting for the Response. The SCP processes the request and sends the response.
 * Note ProcessHandler is the class which implements interface IProcessHandler or extends ProcessHandler.
 * This class is implemented to test the C-Echo SCP.
 * In order to run the following class , please refer to this link($Link) to create the environment.
 * To implement an SCP of a particular we need to do the following things :
 * To create SCP user should either has to implement class IProcessHandler (which is an interface ) or extends Process handler.
 * If test code implements process handler then user has to provide implementation of the methods declared in the interface.
 * Otherwise he can extend the process handler which contains the default implementation for processing of association and service request.
 * Create the SCPSession object which maintains the session of the SCP. 
 * Set the services for which SCP is started and Process handler(reference of test code) in SCPSession.
 * Its "start" method starts the SCP server.
 * When an SCU connects to the C-Echo SCP then when the connection is accepted client session is created for that SCU.
 * When SCU connects to the C-Echo SCP the call back on onConnect of ProcessHandler is made. Now user can get the connection parameters
 * from client session and can decide whether to accept the connection or not. To accept the connection user has to
 * pass true to acceptConnection function in ClientSession class.
 * After the connection is established the next request expected to arrive at SCP is Association request.
 * SCP accepts the association request for Asynchronous mode by setting Number of operations invoked and performed to 0.
 * When Association request arrives, callback is made to onAssociateReceive method of ProcessHandler.
 * User now can negotiate Association request with the default association and creates AssociateAC or Reject.
 * The library provides AssociationNegotiator Class to negotiate and create appropriate response.
 * When C-Echo request arrives the call back is made to onServiceRequest method of ProcessHandler.
 * The user can get the C-Echo Request from current ClientSession object passed in onServiceRequest method, processes it
 * and creates C-Echo-RSP. SDK provides processRequest method in CEchoSCP to process the request and generates response.
 * The C-Echo SCP can handle multiple request simultaneously.
 * After this, when A-Release-RQ arrives , Create Release response and send it to the SCU.
 * Whenever the SCU goes down its client session is also closed or SCP can close the client session 
 * by calling close method of client session.
 */
class AsyncCEchoSCPHandler extends ProcessHandler
{
	/**
	 * This method notifies when a new client connection is requested.
	 * A decision is to be made whether to accept or reject the connection.  
	 * @param objClientSession  object of client session.
	 */
	public void onConnect(ClientSession objClientSession)
	{
		objClientSession.acceptConnection(true);
	}

	/**
	 * This method notifies when Association Request, Associate Release Request or Abort is received from one of the 
	 * SCUs. 
	 * If Association Request is received,
	 * 		Create Association Negotiator which negotiates the request with the existing default association and
	 * 		creates an AgreedAssociation which contains the negotiated association values. AssociationNegotiator
	 * 		returns the Association Response as AssociateAC when request is accepted or returns AssociateRJ is 
	 * 		none of the values in Association Request are acceptable.
	 * 	If Associate Release Request is received,
	 * 		Create a Associate Release Response and send the response to the SCU using the respective ClientSession.
	 *  If Abort is received,
	 *  	An Abort response must be generated and sent using ClientSession
	 *    
	 * @param objClientSession  object of client session.
	 */
	public void onAssociateReceive(ClientSession objClientSession) 
	{
		//Get Association RQ
		IDIMSEAssociation objIDIMSEAssociation = objClientSession.getDIMSEAssociation();
		EnumPDUType enumPDUType = objIDIMSEAssociation.getPDUType();
		IDIMSEAssociation objAssociationRSP = null;

		//For Association Request negotiate with Default Association and generate Response
		switch(enumPDUType)
		{
		case ASSOCIATE_RQ :
		{
			System.out.println("Association Request Received");
			AssociateRQ objAssociateRQ = (AssociateRQ)objIDIMSEAssociation;

			//get the default association from Client Session.
			//			Set maximum number of operations performed and invoked as 0 for Asuncronus behaviour.
			DefaultAssociation objDefaultAssociation = objClientSession.getDefaultAssociation();
			objDefaultAssociation.getRQUserInfo().setMaxNumOpsInvoked((short)0);
			objDefaultAssociation.getRQUserInfo().setMaxNumOpsPerformed((short)0);

			//Negotiatie and get Response
			AssociationNegotiator objAssNegotiator = new AssociationNegotiator();
			objAssociationRSP = objAssNegotiator.negotiate(objDefaultAssociation, objAssociateRQ);

			//set agreed association in client Session.
			objClientSession.setAgreedAssociation(objAssNegotiator.getAgreedAssociation());

			//Send Response
			objClientSession.sendAssociationMessage(objAssociationRSP);
			System.out.println("Response of Association Request is sent");
			break;
		}
		case RELEASE_RQ :
		{
			System.out.println("Release Request Received");

			//Create Release Response.
			objAssociationRSP = new AReleaseRQorRP(EnumPDUType.RELEASE_RP);

			//Send Response
			objClientSession.sendAssociationMessage(objAssociationRSP);
			System.out.println("Release Response sent");

			//Close Client Session
			objClientSession.close();
			break;
		}
		case ABORT :
		{
			System.out.println("Abort has arrived Stop Porcessing -- Association is no longer available");
		}
		}
	}

	/**
	 * This method notifies when a service related request is received.
	 * For Example,
	 * If C-Echo-RQ is received,
	 * 		Create CEchoSCP using the ClientSession.
	 * 		Send this response using the ClientSession.
	 *  @param objClientSession  object of client session.
	 */
	public void onServiceRequest(ClientSession objClientSession)
	{
		/*
		 * Create CECHO_SCP get RQ from ClientSession call processRequest and pass C_ECHO_RQ on CECHO_SCP
		 * receive response from CECHO_SCP sendResponse using ClientSession
		 */
		System.out.println("C-Echo request received");
		DIMSEResponse objDResponse = null;
		CEchoSCP objCEchoSCP = CEchoSCP.createInstance(objClientSession); 
		try{
			/*
			 * Process CEcho Request.
			 */
			objDResponse = objCEchoSCP.processRequest(objClientSession.getDicomMessage());

			/*
			 * Send the service message through Client Session.
			 */
			if(objDResponse != null)
				objClientSession.sendServiceMessage(objDResponse);

			System.out.println("C-Echo request sent");
		}catch(IOException ioe)
		{
			ioe.printStackTrace();
			objClientSession.close();
		}
	}
}
