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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j;
import org.eclipse.net4j.util.lifecycle.ILifecycle;
import org.eclipse.net4j.util.lifecycle.LifecycleUtil;
/**
* Enumerates the lifecycle states of an {@link IConnector}.
* <p>
* <dt><b>State Machine Diagram:</b></dt>
* <dd><img src="doc-files/ConnectorStates.png" title="Diagram Connector States" border="0"
* usemap="#ConnectorStates.png"/></dd>
* <p>
* <MAP NAME="ConnectorStates.png"> <AREA SHAPE="RECT" COORDS="26,135,143,159" HREF="ConnectorState.html#DISCONNECTED">
* <AREA SHAPE="RECT" COORDS="449,50,547,73" HREF="ConnectorState.html#CONNECTING"> <AREA SHAPE="RECT"
* COORDS="449,133,549,159" HREF="ConnectorState.html#NEGOTIATING"> <AREA SHAPE="RECT" COORDS="451,216,545,240"
* HREF="ConnectorState.html#CONNECTED"> <AREA SHAPE="POLYGON" COORDS="10,89,11,183,164,183,163,109,77,109,77,89,11,88"
* HREF="../util/lifecycle/ILifecycle.Introspection.html#isActive()"> <AREA SHAPE="POLYGON"
* COORDS="429,10,428,262,597,263,597,30,483,29,483,10,428,11"
* HREF="../util/lifecycle/ILifecycle.Introspection.html#isActive()"> </MAP>
*
* @see IConnector#getState()
* @author Eike Stepper
*/
public enum ConnectorState
{
/**
* Indicates that the {@link IConnector} has not been connected yet or has been disconnected after being connected
* previously.
* <p>
* A connector is <code>DISCONNECTED</code> if and only if it is not {@link LifecycleUtil#isActive(Object) active}.
* A transition to {@link #CONNECTING} can be triggered by calling {@link IConnector#connect(long)} or
* {@link IConnector#connectAsync()}.
*
* @see IConnector#getState()
* @see ILifecycle.Introspection#isActive()
*/
DISCONNECTED,
/**
* Indicates that the {@link IConnector} is currently trying to establish an underlying physical connection like a TCP
* socket connection.
* <p>
* A connector can only be <code>CONNECTING</code> if it is {@link LifecycleUtil#isActive(Object) active}. As soon
* as the underlying physical connection is successfully established the state of the connector automatically
* transitions to {@link #NEGOTIATING}.
*
* @see IConnector#getState()
* @see ILifecycle.Introspection#isActive()
*/
CONNECTING,
/**
* Indicates that the {@link IConnector} has successfully managed to establish the underlying physical connection and
* has currently delegated control over this connection to an {@link IConnectorNegotiator}.
* <p>
* A connector can only be <code>NEGOTIATING</code> if it is {@link LifecycleUtil#isActive(Object) active} and a
* negotiator has been supplied. As soon as the negotiator has successfully negotiated both peers (or a negotiator has
* not been supplied) the state of the connector automatically transitions to {@link #CONNECTED}.
* <p>
* Negotiators can implement arbitrary handshake protocols, challenge-response sequences or other authentication
* procedures. They can also be used to initially setup connection encryption if the connector implementation is not
* able to do so.
*
* @see IConnector#getState()
* @see ILifecycle.Introspection#isActive()
*/
NEGOTIATING,
/**
* Indicates that the {@link IConnector} has successfully managed to establish and negotiate the underlying physical
* connection and is ready now to perform actual communications.
* <p>
* A connector can only be <code>CONNECTED</code> if it is {@link LifecycleUtil#isActive(Object) active}. A
* transition to {@link #DISCONNECTED} can be triggered by calling {@link IConnector#disconnect()}.
*
* @see IConnector#getState()
* @see ILifecycle.Introspection#isActive()
*/
CONNECTED
}
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