Connection.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package org.jboss.com.sun.corba.se.pept.transport;

import org.jboss.com.sun.corba.se.pept.encoding.InputObject;
import org.jboss.com.sun.corba.se.pept.encoding.OutputObject;
import org.jboss.com.sun.corba.se.pept.protocol.MessageMediator;

/**
 * <p>
 * <code>Connection</code> represents a <em>transport</em> in the PEPt architecture.
 * </p>
 * 
 * @author Harold Carr
 */
public interface Connection
{
    /**
     * Used to determine if the <code>Connection</code> should register with the
     * {@link org.jboss.com.sun.corba.se.pept.transport.TransportManager TransportManager}
     * {@link org.jboss.com.sun.corba.se.pept.transport.Selector Selector} to handle read events.
     * 
     * For example, an HTTP transport would not register since the requesting thread would just block on read when
     * waiting for the reply.
     * 
     * @return <code>true</code> if it should be registered.
     */
    public boolean shouldRegisterReadEvent();

    /**
     * Used to determine if the <code>Connection</code> should register with the
     * {@link org.jboss.com.sun.corba.se.pept.transport.TransportManager TransportManager}
     * {@link org.jboss.com.sun.corba.se.pept.transport.Selector Selector} to handle read events.
     * 
     * For example, an HTTP transport would not register since the requesting thread would just block on read when
     * waiting for the reply.
     * 
     * @return <code>true</code> if it should be registered.
     */
    public boolean shouldRegisterServerReadEvent(); // REVISIT - why special?

    /**
     * Called to read incoming messages.
     * 
     * @return <code>true</code> if the thread calling read can be released.
     */
    public boolean read();

    /**
     * Close the <code>Connection</code>.
     * 
     */
    public void close();

    // REVISIT: replace next two with PlugInFactory (implemented by ContactInfo
    // and Acceptor).

    /**
     * Get the {@link org.jboss.com.sun.corba.se.pept.transport.Acceptor Acceptor} that created this <code>Connection</code>.
     * 
     * @return {@link org.jboss.com.sun.corba.se.pept.transport.Acceptor Acceptor}
     */
    public Acceptor getAcceptor();

    /**
     * Get the {@link org.jboss.com.sun.corba.se.pept.transport.ContactInfo ContactInfo} that created this <code>Connection</code>
     * .
     * 
     * @return {@link org.jboss.com.sun.corba.se.pept.transport.ContactInfo ContactInfo}
     */
    public ContactInfo getContactInfo();

    /**
     * Get the {@link org.jboss.com.sun.corba.se.pept.transport.EventHandler EventHandler} associated with this
     * <code>Acceptor</code>.
     * 
     * @return {@link org.jboss.com.sun.corba.se.pept.transport.EventHandler EventHandler}
     */
    public EventHandler getEventHandler();

    /**
     * Indicates whether a {@link org.jboss.com.sun.corba.se.pept.transport.ContactInfo ContactInfo} or a
     * {@link org.jboss.com.sun.corba.se.pept.transport.Acceptor Acceptor} created the <code>Connection</code>.
     * 
     * @return <code>true</code> if <code>Connection</code> an {@link org.jboss.com.sun.corba.se.pept.transport.Acceptor Acceptor}
     *         created the <code>Connection</code>.
     */
    public boolean isServer();

    /**
     * Indicates if the <code>Connection</code> is in the process of sending or receiving a message.
     * 
     * @return <code>true</code> if the <code>Connection</code> is busy.
     */
    public boolean isBusy();

    /**
     * Timestamps are used for connection management, in particular, for reclaiming idle <code>Connection</code>s.
     * 
     * @return the "time" the <code>Connection</code> was last used.
     */
    public long getTimeStamp();

    /**
     * Timestamps are used for connection management, in particular, for reclaiming idle <code>Connection</code>s.
     * 
     * @param time
     *            - the "time" the <code>Connection</code> was last used.
     */
    public void setTimeStamp(long time);

    /**
     * The "state" of the <code>Connection</code>.
     * 
     * param state
     */
    public void setState(String state);

    /**
     * Grab a write lock on the <code>Connection</code>.
     * 
     * If another thread already has a write lock then the calling thread will block until the lock is released. The
     * calling thread must call {@link #writeUnlock} when it is done.
     */
    public void writeLock();

    /**
     * Release a write lock on the <code>Connection</code>.
     */
    public void writeUnlock();

    /*
     * Send the data encoded in {@link org.jboss.com.sun.corba.se.pept.encoding.OutputObject OutputObject} on the
     * <code>Connection</code>.
     * 
     * @param outputObject
     */
    public void sendWithoutLock(OutputObject outputObject);

    /**
     * Register an invocation's {@link org.jboss.com.sun.corba.se.pept.protocol.MessageMediator MessageMediator} with the
     * <code>Connection</code>.
     * 
     * This is useful in protocols which support fragmentation.
     * 
     * @param messageMediator
     */
    public void registerWaiter(MessageMediator messageMediator);

    /**
     * If a message expect's a response then this method is called.
     * 
     * This method might block on a read (e.g., HTTP), put the calling thread to sleep while another thread read's the
     * response (e.g., GIOP), or it may use the calling thread to perform the server-side work (e.g., Solaris Doors).
     * 
     * @param messageMediator
     */
    public InputObject waitForResponse(MessageMediator messageMediator);

    /**
     * Unregister an invocation's {@link org.jboss.com.sun.corba.se.pept.protocol.MessageMediator MessageMediator} with the
     * <code>Connection</code>.
     * 
     * @param messageMediator
     */
    public void unregisterWaiter(MessageMediator messageMediator);

    public void setConnectionCache(ConnectionCache connectionCache);

    public ConnectionCache getConnectionCache();
}

// End of file.