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172 lines
6.1 KiB
172 lines
6.1 KiB
/*
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* Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*/
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package com.sun.jmx.snmp.daemon;
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/**
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* Defines generic behaviour for the server
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* part of a connector or an adaptor. Most connectors or adaptors extend <CODE>CommunicatorServer</CODE>
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* and inherit this behaviour. Connectors or adaptors that do not fit into this model do not extend
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* <CODE>CommunicatorServer</CODE>.
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* <p>
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* An <CODE>CommunicatorServer</CODE> is an active object, it listens for client requests
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* and processes them in its own thread. When necessary, a <CODE>CommunicatorServer</CODE>
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* creates other threads to process multiple requests concurrently.
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* <p>
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* A <CODE>CommunicatorServer</CODE> object can be stopped by calling the <CODE>stop</CODE>
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* method. When it is stopped, the <CODE>CommunicatorServer</CODE> no longer listens to client
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* requests and no longer holds any thread or communication resources.
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* It can be started again by calling the <CODE>start</CODE> method.
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* <p>
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* A <CODE>CommunicatorServer</CODE> has a <CODE>state</CODE> property which reflects its
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* activity.
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* <p>
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* <TABLE>
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* <TR><TH>CommunicatorServer</TH> <TH>State</TH></TR>
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* <TR><TD><CODE>stopped</CODE></TD> <TD><CODE>OFFLINE</CODE></TD></TR>
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* <TR><TD><CODE>starting</CODE></TD> <TD><CODE>STARTING</CODE></TD></TR>
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* <TR><TD><CODE>running</CODE></TD> <TD><CODE>ONLINE</CODE></TD></TR>
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* <TR><TD><CODE>stopping</CODE></TD> <TD><CODE>STOPPING</CODE></TD></TR>
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* </TABLE>
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* <p>
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* The <CODE>STARTING</CODE> state marks the transition from <CODE>OFFLINE</CODE> to
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* <CODE>ONLINE</CODE>.
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* <p>
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* The <CODE>STOPPING</CODE> state marks the transition from <CODE>ONLINE</CODE> to
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* <CODE>OFFLINE</CODE>. This occurs when the <CODE>CommunicatorServer</CODE> is
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* finishing or interrupting active requests.
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* <p>
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* A <CODE>CommunicatorServer</CODE> may serve several clients concurrently. The
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* number of concurrent clients can be limited using the property
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* <CODE>maxActiveClientCount</CODE>. The default value of this property is
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* defined by the subclasses.
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* <p>
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* When a <CODE>CommunicatorServer</CODE> is unregistered from the MBeanServer,
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* it is stopped automatically.
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*
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* <p><b>This API is a Sun Microsystems internal API and is subject
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* to change without notice.</b></p>
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*/
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public interface CommunicatorServerMBean {
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/**
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* Starts this <CODE>CommunicatorServer</CODE>.
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* <p>
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* Has no effect if this <CODE>CommunicatorServer</CODE> is <CODE>ONLINE</CODE> or
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* <CODE>STOPPING</CODE>.
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*/
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public void start() ;
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/**
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* Stops this <CODE>CommunicatorServer</CODE>.
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* <p>
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* Has no effect if this <CODE>CommunicatorServer</CODE> is <CODE>OFFLINE</CODE> or
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* <CODE>STOPPING</CODE>.
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*/
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public void stop() ;
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/**
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* Tests if the <CODE>CommunicatorServer</CODE> is active.
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*
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* @return True if connector is <CODE>ONLINE</CODE>; false otherwise.
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*/
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public boolean isActive() ;
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/**
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* Waits untill either the State attribute of this MBean equals the specified <VAR>state</VAR> parameter,
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* or the specified <VAR>timeOut</VAR> has elapsed. The method <CODE>waitState</CODE> returns with a boolean value indicating whether
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* the specified <VAR>state</VAR> parameter equals the value of this MBean's State attribute at the time the method terminates.
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*
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* Two special cases for the <VAR>timeOut</VAR> parameter value are:
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* <UL><LI> if <VAR>timeOut</VAR> is negative then <CODE>waitState</CODE> returns immediately (i.e. does not wait at all),</LI>
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* <LI> if <VAR>timeOut</VAR> equals zero then <CODE>waitState</CODE> waits untill the value of this MBean's State attribute
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* is the same as the <VAR>state</VAR> parameter (i.e. will wait indefinitely if this condition is never met).</LI></UL>
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*
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* @param state The value of this MBean's State attribute
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* to wait for. <VAR>state</VAR> can be one of:
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* <ul>
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* <li><CODE>CommunicatorServer.OFFLINE</CODE>,</li>
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* <li><CODE>CommunicatorServer.ONLINE</CODE>,</li>
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* <li><CODE>CommunicatorServer.STARTING</CODE>,</li>
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* <li><CODE>CommunicatorServer.STOPPING</CODE>.</li>
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* </ul>
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* @param timeOut The maximum time to wait for, in
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* milliseconds, if positive.
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* Infinite time out if 0, or no waiting at all if negative.
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*
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* @return true if the value of this MBean's State attribute is the
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* same as the <VAR>state</VAR> parameter; false otherwise.
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*/
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public boolean waitState(int state , long timeOut) ;
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/**
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* Gets the state of this <CODE>CommunicatorServer</CODE> as an integer.
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*
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* @return <CODE>ONLINE</CODE>, <CODE>OFFLINE</CODE>, <CODE>STARTING</CODE> or <CODE>STOPPING</CODE>.
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*/
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public int getState() ;
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/**
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* Gets the state of this <CODE>CommunicatorServer</CODE> as a string.
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*
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* @return One of the strings "ONLINE", "OFFLINE", "STARTING" or "STOPPING".
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*/
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public String getStateString() ;
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/**
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* Gets the host name used by this <CODE>CommunicatorServer</CODE>.
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*
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* @return The host name used by this <CODE>CommunicatorServer</CODE>.
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*/
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public String getHost() ;
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/**
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* Gets the port number used by this <CODE>CommunicatorServer</CODE>.
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*
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* @return The port number used by this <CODE>CommunicatorServer</CODE>.
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*/
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public int getPort() ;
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/**
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* Sets the port number used by this <CODE>CommunicatorServer</CODE>.
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*
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* @param port The port number used by this <CODE>CommunicatorServer</CODE>.
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*
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* @exception java.lang.IllegalStateException This method has been invoked
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* while the communicator was ONLINE or STARTING.
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*/
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public void setPort(int port) throws java.lang.IllegalStateException ;
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/**
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* Gets the protocol being used by this <CODE>CommunicatorServer</CODE>.
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* @return The protocol as a string.
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*/
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public abstract String getProtocol() ;
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}
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