org.rzo.netty.ahessian.rpc.message.HessianRPCReplyDecoder.java Source code

Introduction

Here is the source code for org.rzo.netty.ahessian.rpc.message.HessianRPCReplyDecoder.java

Source

/*******************************************************************************
 * Copyright  2015 rzorzorzo@users.sf.net
 *
 * 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 org.rzo.netty.ahessian.rpc.message;

import io.netty.channel.ChannelHandlerContext;

import java.io.InputStream;

import org.rzo.netty.ahessian.Constants;
import org.rzo.netty.ahessian.io.InputStreamConsumer;
import org.rzo.netty.ahessian.io.InputStreamHandler;
import org.rzo.netty.ahessian.rpc.callback.CallbackReplyMessage;
import org.rzo.netty.ahessian.rpc.client.HessianProxyFactory;
import org.rzo.netty.ahessian.rpc.io.Hessian2Input;

import com.caucho.hessian4.io.AbstractSerializerFactory;
import com.caucho.hessian4.io.HessianProtocolException;

/**
 * reads a reply message from an input stream
 */
public class HessianRPCReplyDecoder implements InputStreamConsumer, Constants {

    /** The _factory. */
    HessianProxyFactory _factory;
    volatile Hessian2Input in = null;
    volatile AbstractSerializerFactory _serializerFactory;

    /**
     * Instantiates a new hessian rpc reply decoder.
     * 
     * @param factory
     *            the factory
     */
    public HessianRPCReplyDecoder(HessianProxyFactory factory) {
        _factory = factory;
    }

    public HessianRPCReplyDecoder(HessianProxyFactory factory, AbstractSerializerFactory serializerFactory) {
        _factory = factory;
        _serializerFactory = serializerFactory;
    }

    public void consume(ChannelHandlerContext ctx, InputStream inx) {
        while (ctx.channel().isActive() && !isBufferEmpty()) {
            HessianRPCReplyMessage m = parseReply(in);
            if (m != null)
                ctx.fireChannelRead(m);

            in.resetReferences();

            if (isBufferEmpty()) {
                break;
            }
        }

    }

    /**
     * Parses the reply.
     * 
     * @param is
     *            the is
     * 
     * @return the hessian rpc reply message
     */
    HessianRPCReplyMessage parseReply(Hessian2Input in) {
        Object value = null;
        Object fault = null;
        Long callbackId = null;
        Long callbackCallId = null;
        String callbackMethod = null;
        Object[] callbackArgs = null;
        Boolean callbackDone = null;
        Boolean completed = null;
        Integer group = null;
        Long callId = null;
        int code;
        try {
            if ((code = in.read()) != 'H') {
                throw new HessianProtocolException(
                        "H expected got " + "0x" + Integer.toHexString(code & 0xff) + " (" + (char) +code + ")");
            }
            in.read();
            in.read();
            in.readEnvelope();
            String h = in.readString();
            if (!HEADER_STRING.equals(h)) {
                throw new HessianProtocolException("Missing headers");
            }
            int l = in.readInt();
            for (int i = 0; i < l; i++) {
                Integer key = in.readInt();
                Object hvalue = in.readObject();
                switch (key) {

                case ICALLBACK_ID_HEADER_KEY:
                    callbackId = (Long) hvalue;
                    break;
                case ICALLBACK_CALL_ID_HEADER_KEY:
                    callbackCallId = (Long) hvalue;
                    break;
                case ICALLBACK_METHOD_HEADER_KEY:
                    callbackMethod = (String) hvalue;
                    break;
                case ICALLBACK_ARGS_HEADER_KEY:
                    callbackArgs = (Object[]) hvalue;
                    break;
                case ICALLBACK_DONE_HEADER_KEY:
                    callbackDone = (Boolean) hvalue;
                    break;
                case ICOMPLETED_HEADER_KEY:
                    completed = (Boolean) hvalue;
                    break;
                case IGROUP_HEADER_KEY:
                    group = (Integer) hvalue;
                    break;
                case ICALL_ID_HEADER_KEY:
                    callId = (Long) hvalue;
                    break;
                }
            }
            if ((code = in.read()) != 'H') {
                throw new HessianProtocolException("'" + (char) code + "' is an unknown code");
            }
            in.read();
            in.read();

            Object obj = null;
            try {
                obj = in.readReply(null);
            } catch (Throwable e) {
                HessianRPCReplyMessage result = new HessianRPCReplyMessage(null, e, null);
                result.setCallId(callId);
                result.setGroup(group);
                result.setCallbackId(callbackId);
                return result;
            } finally {
                in.completeReply();
                in.completeEnvelope();
                in.resetReferences();
            }

            if (callbackId != null) {

                CallbackReplyMessage result = new CallbackReplyMessage(callbackMethod, callbackArgs, null, null);
                result.setCallbackDone(callbackDone);
                result.setCallbackId(callbackId);
                result.setCallId(callId);
                result.setCompleted(completed);
                result.setGroup(group);
                result.setCallbackCallId(callbackCallId);
                return result;
            } else {
                HessianRPCReplyMessage result = new HessianRPCReplyMessage(obj, null, null);
                result.setCallId(callId);
                result.setCompleted(completed);
                result.setGroup(group);
                return result;
            }

        } catch (Throwable ex) {
            if (ex.getMessage() != null && ex.getMessage().startsWith("H expected got 0x0"))
                Constants.ahessianLogger.info("received Ping");
            else
                Constants.ahessianLogger.warn("", ex);
            if (callId != null) {
                HessianRPCReplyMessage result = new HessianRPCReplyMessage(null, ex, null);
                result.setCallId(callId);
                result.setGroup(group);
                result.setCallbackId(callbackId);
                return result;
            }

        }
        return null;

    }

    public boolean isBufferEmpty() {
        return in != null && in.bufferEmpty();
    }

    public void setContext(ChannelHandlerContext ctx) {
        if (in == null) {
            in = new Hessian2Input(InputStreamHandler.getInputStream(ctx));
            if (_serializerFactory != null)
                in.getSerializerFactory().addFactory(_serializerFactory);
        }
    }

}