org.apache.james.protocols.api.ProtocolTransport Maven / Gradle / Ivy

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package org.apache.james.protocols.api;

import java.net.InetSocketAddress;

import org.apache.james.protocols.api.handler.LineHandler;

/**
 * ProtocolTransport is used by each ProtocolSession to communicate with the underlying transport.
 * Transport implementations will provide their own implementation of the transport.
 * 
 * Every new connection gets a new instance of {@link ProtocolTransport}. So its not shared between connections.
 */
public interface ProtocolTransport {

    /**
     * Return the {@link InetSocketAddress} of the remote peer
     */
    InetSocketAddress getRemoteAddress();

    /**
     * Return the {@link InetSocketAddress} of the local bound address
     */
    InetSocketAddress getLocalAddress();

    
    /**
     * Return the unique id. The id MUST NOT be 100 % unique for ever. It just should just not have the same
     * id when having concurrent connections
     */
    String getId();

    /**
     * Return true if TLS encryption is active
     */
    boolean isTLSStarted();

    /**
     * Return true if STARTTLS is supported by this {@link ProtocolTransport}
     */
    boolean isStartTLSSupported();
    
    /**
     * Write the {@link Response} to the {@link ProtocolTransport} which will forward it to the connected
     * peer
     */
    void writeResponse(Response response, ProtocolSession session);

    /**
     * Pop a {@link LineHandler} of the stack
     */
    void popLineHandler();

    /**
     * Push a {@link LineHandler} in.
     */
    void pushLineHandler(LineHandler overrideCommandHandler, ProtocolSession session);

    /**
     * Return the count of pushed {@link LineHandler}'s
     */
    int getPushedLineHandlerCount();
    
    
    /**
     * Set the {@link ProtocolTransport} readable or not. If its not readable then no new lines should get processed
     */
    void setReadable(boolean readable);

    /**
     * Return true if the channel is readable
     */
    boolean isReadable();
}