MediaProxyImplBean.java

/* Generated by Together */

package multimonster.mediaproxy;

import java.rmi.RemoteException;

import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.RemoveException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import multimonster.common.Action;
import multimonster.common.ConnectionAddress;
import multimonster.common.FormatId;
import multimonster.common.ProtocolId;
import multimonster.common.Session;
import multimonster.common.media.MOIdentifier;
import multimonster.common.pipe.Pipe;
import multimonster.common.resource.ResourceRequestIdentifier;
import multimonster.common.util.EjbCreator;
import multimonster.common.util.EjbHomeGetter;
import multimonster.controller.exceptions.ControllerException;
import multimonster.controller.interfaces.ControllerImpl;
import multimonster.controller.interfaces.ControllerImplHome;
import multimonster.mediaproxy.exceptions.MediaProxyException;
import multimonster.transporter.exceptions.TransporterException;
import multimonster.transporter.interfaces.TransporterImpl;
import multimonster.transporter.interfaces.TransporterImplHome;

import org.apache.log4j.Logger;

/**
 * 
 * @ejb.bean	name = "MediaProxyImpl"
 * 				display-name = "MediaProxyFacade SessionBean"
 * 				description = "The Facade of the MediaProxy-Package of MultiMonster"
 * 				view-type = "remote"
 * 				jndi-name = "multimonster/mediaproxy/MediaProxyFacade"
 */
public class MediaProxyImplBean implements MediaProxyFacade, SessionBean {

	private SessionContext ctx;
	private Context context;
	private Logger log;
	
	ControllerImplHome controllerHome;
	TransporterImplHome transporterHome;

	public void setSessionContext(SessionContext context) throws RemoteException, EJBException {
		ctx = context;
	}

	public void ejbActivate() throws EJBException {
	}

	public void ejbPassivate() throws EJBException {
	}

	public void ejbRemove() throws EJBException {
	}

	/**
	 * @ejb.create-method 
	 * 
	 * @throws CreateException
	 * @throws EJBException
	 */
	public void ejbCreate() throws CreateException, EJBException {
		log = Logger.getLogger(this.getClass());
		log.debug("EJB created.");
		
		try {
			context = new InitialContext();
			
			controllerHome = EjbHomeGetter.getControllerHome(context);
			transporterHome = EjbHomeGetter.getTransporterHome(context);			
			
		} catch (NamingException e) {
			log.error("Couldn't get referenced EJB-Home-Interfaces.");
		}
	}

	/* (non-Javadoc)
	 * @see multimonster.mediaproxy.MediaProxyFacade#getOutputProxy(multimonster.common.Protocol)
	 */
	/**
	 * @ejb.interface-method view-type = "remote"
	 */
	public ConnectionAddress getOutputProxy(Session session, MOIdentifier mOId, FormatId fId, ProtocolId protocolId) throws MediaProxyException {
		
		log.debug("getOutputProxy() called.");
		
		ConnectionAddress addr = null;
		MediaProxyPluginFactory mppFactory = null;
		MediaProxyPlugin mpPlugin = null;
		String errorText = "";

		// check parameters
		if (session == null) {
			errorText = "session is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else if (mOId == null) {
			errorText = "mOId is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else if (fId == null) {
			errorText = "fId is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else if (protocolId == null) {
			errorText = "protocol is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else {
			log.debug("Parameter ok.");
		}
		
		// get factory and produce plugin
		mppFactory = MediaProxyPluginFactory.getInstance();
		
		mpPlugin = mppFactory.getOutputProxy(session, mOId, protocolId, fId);
		
		addr = mpPlugin.getConnectionAddress();
		
		if (addr == null) {
			errorText = "Didn't get ConnectionAddress of produced proxy.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}		

		return addr;
	}

	/* (non-Javadoc)
	 * @see multimonster.mediaproxy.MediaProxyFacade#getInputProxy(multimonster.common.Protocol)
	 */
	/**
	 * @ejb.interface-method view-type = "remote"
	 */
	public ConnectionAddress getInputProxy(Session session, MOIdentifier mOId, ProtocolId protocolId) throws MediaProxyException {
		
		log.debug("getInputProxy() called.");
		
		ConnectionAddress addr = null;
		MediaProxyPluginFactory mppFactory = null;
		MediaProxyPlugin mpPlugin = null;
		String errorText = "";

		// check parameter
		if (session == null) {
			errorText = "Parameter session is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else if (mOId == null) {
			errorText = "Parameter mOId is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else if (protocolId == null) {
			errorText = "Parameter protocol is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} else {
			log.debug("Parameter ok.");
		}
		
		mppFactory = MediaProxyPluginFactory.getInstance();
		
		if (mppFactory == null){
			errorText = "Couldn't get PlugInFactory - mppFactory null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}
		
		mpPlugin = mppFactory.getInputProxy(session, mOId, protocolId);
		
		if (mpPlugin == null){
			errorText = "Factory didn't produce Plugin for mOId (" +mOId +") and protocolId (" +protocolId +") - mpPlugin is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}
		
		addr = mpPlugin.getConnectionAddress();
		
		if (addr == null) {
			errorText = "Didn't get ConnectionAddress of produced proxy.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}

		return addr;
	}

	/* (non-Javadoc)
	 * @see multimonster.mediaproxy.MediaProxyFacade#initOutput(multimonster.common.Session, multimonster.common.MOIdentifier, multimonster.common.Format, multimonster.common.Protocol, multimonster.common.Action)
	 */
	/**
	 * @ejb.interface-method view-type = "remote"
	 */
	public ProxyInitObjects initWork(Session session, MOIdentifier mOId, FormatId fId, ProtocolId protocolId, Action action, boolean isInput) throws MediaProxyException {
		
		log.debug("initWork() called.");
		
		ProxyInitObjects pio = null;				
		ControllerImpl controller;
		TransporterImpl transporter;
		boolean authAnswer = false;	
		ResourceRequestIdentifier rrId = null;
		Pipe pipeFromTransporter = null;	
		String errorText = "";
		
		// parameter check
		if (session == null) {
			errorText = "session is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} else if (mOId == null) {
			errorText = "mOId is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} else if (fId == null) {
			log.debug("FormatId is null - can only do input, otherwise transporter will crash.");			
		} else if (protocolId == null) {
			errorText = "protocol is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} else if (action == null) {
			errorText = "action is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} else {
			log.debug("parameter ok.");
		}
		
		// trying to get ControllerEJB
		try {
			controller = EjbCreator.createController(controllerHome, context);		
						
		} catch (Exception e) {
			errorText = "Couldn't get Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);
		}
		
		
		try {				
			/* authorize request */
			authAnswer = controller.authorize(session, mOId, action);			
			
			if (authAnswer == false) {
				errorText = "Request is not allowed!";
				log.warn(errorText);
				throw new MediaProxyException(errorText);
			}
			
			/* requestRessource */
			rrId = controller.requestResources(session, mOId, fId, protocolId, action);
			
			if (rrId == null) {
				errorText = "Didn't get a ResourceRequestIdentifier.!";
				log.error(errorText);
				throw new MediaProxyException(errorText);						
			}
			
			controller.remove();						
		
		} catch (RemoteException e) {
			errorText = "Error calling remote object: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} catch (RemoveException e) {
			errorText = "Couldn't remove Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		} catch (ControllerException e) {
			errorText = "Error in Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}

		// trying to get TransporterEJB
		try {
			transporter = EjbCreator.createTransporter(transporterHome, context);		
						
		} catch (Exception e) {
			errorText = "Couldn't create Transporter: " +e.getMessage();
			log.error(errorText);
			
			requestFinished(rrId);
			throw new MediaProxyException(errorText);			
		}

		try {			
			
			/* get pipe from transporter */
			if (isInput) {
				pipeFromTransporter = transporter.input(mOId, protocolId);
			} else {			
				pipeFromTransporter = transporter.output(mOId, fId, protocolId);
			}
			
			if (pipeFromTransporter == null){
				errorText = "Didn't get a pipe from transporter.";
				log.error(errorText);
				
				requestFinished(rrId);
				throw new MediaProxyException(errorText);							
			}
			
			transporter.remove();
		
		} catch (RemoteException e) {
			errorText = "";
			log.error(errorText);
			
			requestFinished(rrId);
			throw new MediaProxyException(errorText);			
		} catch (RemoveException e) {
			errorText = "";
			log.error(errorText);
			
			requestFinished(rrId);
			throw new MediaProxyException(errorText);			
		} catch (TransporterException e1) {
			errorText = "Didn't get Pipe from Transporter: " + e1.getMessage()
						+" (rrId: " +rrId.getId() +")";
			log.error(errorText);
			
			requestFinished(rrId);
			throw new MediaProxyException(errorText);
		}
		// packing everything together:
		pio = new ProxyInitObjects(pipeFromTransporter, rrId);
		
		// pipeSetup finished
		pipeFromTransporter.setupFinished();
		
		return pio;
	}

	/* (non-Javadoc)
	 * @see multimonster.mediaproxy.MediaProxyFacade#requestFinished(multimonster.common.ResourceRequestIdentifier)
	 */
	/**
	 * @ejb.interface-method view-type = "remote"
	 */
	public void requestFinished(ResourceRequestIdentifier rrId) throws MediaProxyException {
		
		log.debug("requestFinished called.");
		
		ControllerImpl controller = null;
		String errorText = "";
		
		// paramter check
		if (rrId == null){
			errorText = "rrId is null - aborting.";
			log.error(errorText);
			throw new MediaProxyException(errorText);			
		}
		
		// trying to get ControllerEJB
		try {
			controller = EjbCreator.createController(controllerHome, context);		
						
		} catch (Exception e) {
			errorText = "Couldn't get Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);
		}
		
		try {
			/* release Resources */
			controller.releaseResource(rrId);
			
			controller.remove();
			
		} catch (RemoteException e1) {
			errorText = "Error calling remote Object: " +e1.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} catch (RemoveException e) {
			errorText = "Couldn't remove Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);
		} catch (ControllerException e) {
			errorText = "Couldn't remove Controller: " +e.getMessage();
			log.error(errorText);
			throw new MediaProxyException(errorText);
		}
		
		return;
	}


	/**
	 * @ejb.interface-method view-type = "remote"
	 */
	public void directInput(byte[] file, String link) {
		
		log.warn("This method isn't implemented anymore! Use real InputProxy.");
			
	
	}

}