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package com.sun.enterprise.jbi.serviceengine.bridge.transport;

import com.sun.enterprise.jbi.serviceengine.core.ServiceEngineEndpoint;
import com.sun.enterprise.webservice.EjbRuntimeEndpointInfo;
import com.sun.xml.ws.api.message.Message;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.server.Adapter;
import com.sun.xml.ws.api.server.TransportBackChannel;
import com.sun.xml.ws.api.server.WSEndpoint;
import com.sun.logging.LogDomains;

import java.util.logging.Logger;
import java.util.logging.Level;
import javax.jbi.messaging.MessageExchange;

/**
 * Adapter class that invokes the Endpoint. It uses an inner class to handle
 * the inbound request.
 *
 * @author Vikas Awasthi
 */
public class JBIAdapter extends Adapter<JBIAdapter.WSToolkit> {
    
    private final Logger logger = LogDomains.getLogger(LogDomains.SERVER_LOGGER);
    private NMRServerConnection con;
    private ClassLoader classLoader;
    private EjbRuntimeEndpointInfo ejbEndPtInfo;
    
    /**
     * Creates an {@link com.sun.xml.ws.api.server.Adapter} that delivers
     * messages to the given endpoint.
     */
    public JBIAdapter(WSEndpoint endpoint, 
                      ServiceEngineEndpoint endpt, 
                      MessageExchange me,
                      ClassLoader classLoader,
                      EjbRuntimeEndpointInfo ejbEndPtInfo) {
        super(endpoint);
        con = new NMRServerConnection(me, endpt);
        this.classLoader = classLoader;
        this.ejbEndPtInfo = ejbEndPtInfo;
    }
    
    protected WSToolkit createToolkit() {
        return new WSToolkit();
    }

    public void handle() {
        WSToolkit tk = pool.take();
        try {
            tk.handle();
        }finally {
            pool.recycle(tk);
        }
    }

    public void handleException(Exception ex) {
        con.handleException(ex);
    }

    public ClassLoader getClassLoader() {
        return classLoader;
    }
    
    /** For every EJB endpoint invocation a preInvoke and postInvoke must be
     * called. The preInvoke is called during the creation of JBIAdapter in  
     * JBIAdapterBuilder. The postInvoke method should be called before 
     * returning the response back to NMR. 
     * For non-EJB cases ejbEndPtInfo will be null. */
    private void postInvoke() {
        if(ejbEndPtInfo!=null)
            ejbEndPtInfo.releaseImplementor();
    }
    
    final class WSToolkit extends Adapter.Toolkit implements TransportBackChannel {
        
        public void handle() {
            Packet packet = new Packet();
            packet.setMessage(con.receiveRequest());
            try {
                packet = head.process(packet,con,this);
            } catch(Exception e) {
                logger.log(Level.SEVERE,"Exception in invoking the service:"
                        + e.getMessage());
                postInvoke();
                handleException(e);
                return;
            }
            
            postInvoke();
            Message responseMessage = packet.getMessage();
            try {
                con.sendResponse(responseMessage);
            } catch(Exception e) {
                logger.log(Level.SEVERE, e.getMessage(), e);
                handleException(e);
            }
        }

        /** This method is called during the execution of head.process() before 
         * the endpoint is invoked. This callback is used in HTTPAdapter to 
         * send back the response to the client immediately.
         * With JBI there is no need to use this method. */
        public void close() {
        }
        
    }

}