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package com.sun.xml.internal.ws.api.server;

import com.oracle.webservices.internal.api.message.PropertySet;
import com.sun.istack.internal.NotNull;
import com.sun.istack.internal.Nullable;
import com.sun.xml.internal.ws.api.message.Message;
import com.sun.xml.internal.ws.api.message.Packet;
import com.sun.xml.internal.ws.api.pipe.Codec;
import com.sun.xml.internal.ws.util.Pool;

import java.io.IOException;


Partial server side async transport implementation. It manages pooling of Codec and other details. 
Author:
Jitendra Kotamraju/**
 * Partial server side async transport implementation. It manages pooling of
 * {@link Codec} and other details.
 *
 * @author Jitendra Kotamraju
 */
public abstract class AbstractServerAsyncTransport<T> {

    private final WSEndpoint endpoint;
    private final CodecPool codecPool;

    
WSEndpoint.setExecutor should be called before creating the transport 
Params:
endpoint – webservices requests are directed towards this endpoint/**
     * {@link WSEndpoint#setExecutor} should be called before creating the
     * transport
     *
     * @param endpoint webservices requests are directed towards this endpoint
     */
    public AbstractServerAsyncTransport(WSEndpoint endpoint) {
        this.endpoint = endpoint;
        codecPool = new CodecPool(endpoint);
    }

    
decodes the transport data to Packet
Params:
connection – that carries the web service request
codec – for encoding/decoding Message
Throws:
IOException – if an i/o error happens while encoding/decoding
Returns:
decoded Packet/**
     * decodes the transport data to Packet
     *
     * @param connection that carries the web service request
     * @param codec for encoding/decoding {@link Message}
     * @return decoded {@link Packet}
     * @throws IOException if an i/o error happens while encoding/decoding
     */
    protected Packet decodePacket(T connection, @NotNull Codec codec) throws IOException {
        Packet packet = new Packet();
        packet.acceptableMimeTypes = getAcceptableMimeTypes(connection);
        packet.addSatellite(getPropertySet(connection));
        packet.transportBackChannel = getTransportBackChannel(connection);
        return packet;
    }

    
Encodes the Packet to infoset and writes on the connection. 
Params:
connection – that carries the web service request
packet – that needs to encoded to infoset
codec – that does the encoding of Packet
Throws:
IOException – if an i/o error happens while encoding/decoding/**
     * Encodes the {@link Packet} to infoset and writes on the connection.
     *
     * @param connection that carries the web service request
     * @param packet that needs to encoded to infoset
     * @param codec that does the encoding of Packet
     * @throws IOException if an i/o error happens while encoding/decoding
     */
    protected abstract void encodePacket(T connection, @NotNull Packet packet, @NotNull Codec codec) throws IOException;

    
If the request has Accept header, return that value
Params:
connection – that carries the web service request
Returns:
Accept MIME types/**
     * If the request has Accept header, return that value
     *
     * @param connection that carries the web service request
     * @return Accept MIME types
     */
    protected abstract @Nullable String getAcceptableMimeTypes(T connection);

    
TransportBackChannel used by jax-ws runtime to close the connection while the processing of the request is still continuing. In oneway HTTP case, a response code needs to be sent before invoking the endpoint. 
Params:
connection – that carries the web service request
Returns:
TransportBackChannel instance using the connection/**
     * {@link TransportBackChannel} used by jax-ws runtime to close the connection
     * while the processing of the request is still continuing. In oneway HTTP case, a
     * response code needs to be sent before invoking the endpoint.
     *
     * @param connection that carries the web service request
     * @return TransportBackChannel instance using the connection
     */
    protected abstract @Nullable TransportBackChannel getTransportBackChannel(T connection);

    
If there are any properties associated with the connection, those will be added to Packet 
Params:
connection – that carries the web service request
Returns:
PropertySet for the connection/**
     * If there are any properties associated with the connection, those will
     * be added to {@link Packet}
     *
     * @param connection that carries the web service request
     * @return {@link PropertySet} for the connection
     */
    protected abstract @NotNull PropertySet getPropertySet(T connection);

    
Return a WebServiceContextDelegate using the underlying connection. 
Params:
connection – that carries the web service request
Returns:
non-null WebServiceContextDelegate instance/**
     * Return a {@link WebServiceContextDelegate} using the underlying connection.
     *
     * @param connection that carries the web service request
     * @return non-null WebServiceContextDelegate instance
     */
    protected abstract @NotNull WebServiceContextDelegate getWebServiceContextDelegate(T connection);

    
Reads and decodes infoset from the connection and invokes the endpoints. The
response is encoded and written to the connection. The response could be
written using a different thread.
Params:
connection – that carries the web service request
Throws:
IOException – if an i/o error happens while encoding/decoding/**
     * Reads and decodes infoset from the connection and invokes the endpoints. The
     * response is encoded and written to the connection. The response could be
     * written using a different thread.
     *
     * @param connection that carries the web service request
     * @throws IOException if an i/o error happens while encoding/decoding
     */
    protected void handle(final T connection) throws IOException {
        final Codec codec = codecPool.take();
        Packet request = decodePacket(connection, codec);
        if (!request.getMessage().isFault()) {
            endpoint.schedule(request, new WSEndpoint.CompletionCallback() {
                public void onCompletion(@NotNull Packet response) {
                    try {
                        encodePacket(connection, response, codec);
                    } catch(IOException ioe) {
                        ioe.printStackTrace();
                    }
                    codecPool.recycle(codec);
                }
            });
        }
    }

    private static final class CodecPool extends Pool<Codec> {
        WSEndpoint endpoint;

        CodecPool(WSEndpoint endpoint) {
            this. endpoint = endpoint;
        }

        protected Codec create() {
            return endpoint.createCodec();
        }
    }

}