org.apache.james.protocols.netty.NettyServer Maven / Gradle / Ivy

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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.protocols.netty;


import javax.net.ssl.SSLContext;

import org.apache.james.protocols.api.Protocol;
import org.apache.james.protocols.api.Encryption;
import org.apache.james.protocols.api.handler.ProtocolHandler;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.handler.execution.ExecutionHandler;
import org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor;


/**
 * Generic NettyServer 
 */
public class NettyServer extends AbstractAsyncServer {

    protected final Protocol protocol;
    
    private ExecutionHandler eHandler;
    
    private ChannelUpstreamHandler coreHandler;

    protected final Encryption secure;

    private int maxCurConnections;

    private int maxCurConnectionsPerIP;
   
    public NettyServer(Protocol protocol) {
        this(protocol, null);
    }
    
    
    public NettyServer(Protocol protocol, Encryption secure) {
        super();
        this.protocol = protocol;
        this.secure = secure;
    }
    
    protected ExecutionHandler createExecutionHandler(int size) {
        return new ExecutionHandler(new OrderedMemoryAwareThreadPoolExecutor(size, 0, 0));
    }
    
    
    /**
     * Set true if an ExecutionHandler should be used to hand over the tasks. This should be done if you have some {@link ProtocolHandler}'s which need to full fill some blocking operation.
     * 
     * @param useHandler true if an ExecutionHandler should be used
     * @param size the thread count to use
     */
    public void setUseExecutionHandler(boolean useHandler, int size) {
        if (isBound()) throw new IllegalStateException("Server running already");
        if (useHandler) {
            eHandler = createExecutionHandler(size);
        } else {
            if (eHandler != null) {
                eHandler.releaseExternalResources();
            }
            eHandler = null;
        }
    }
    
    public void setMaxConcurrentConnections(int maxCurConnections) {
        if (isBound()) throw new IllegalStateException("Server running already");
        this.maxCurConnections = maxCurConnections;
    }
  
    public void setMaxConcurrentConnectionsPerIP(int maxCurConnectionsPerIP) {
        if (isBound()) throw new IllegalStateException("Server running already");
        this.maxCurConnectionsPerIP = maxCurConnectionsPerIP;
    }
    
    protected ChannelUpstreamHandler createCoreHandler() {
        return new BasicChannelUpstreamHandler(protocol, secure);
    }
    
    @Override
    public synchronized void bind() throws Exception {
        coreHandler = createCoreHandler();
        super.bind();
    }


    @Override
    protected ChannelPipelineFactory createPipelineFactory(ChannelGroup group) {

        return new AbstractSSLAwareChannelPipelineFactory(getTimeout(), maxCurConnections, maxCurConnectionsPerIP, group, eHandler) {

            @Override
            protected ChannelUpstreamHandler createHandler() {
                return coreHandler;
            }

            @Override
            protected boolean isSSLSocket() {
                return getSSLContext() != null && secure != null && !secure.isStartTLS();
            }

            @Override
            protected SSLContext getSSLContext() {
                if (secure != null) {
                    return secure.getContext();
                } else  {
                    return null;
                }
            }
        };

    }

}