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Java example source code file (EventHandlerBase.java)

This example Java source code file (EventHandlerBase.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

corba, eventhandlerbase, internal, nosuchthreadpoolexception, nosuchworkqueueexception, selectionkey, throwable, work

The EventHandlerBase.java Java example source code

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.corba.se.impl.transport;

import java.nio.channels.SelectionKey;

import org.omg.CORBA.INTERNAL;

import com.sun.corba.se.pept.transport.Acceptor;
import com.sun.corba.se.pept.transport.Connection;
import com.sun.corba.se.pept.transport.EventHandler;

import com.sun.corba.se.spi.orb.ORB;
import com.sun.corba.se.spi.orbutil.threadpool.NoSuchThreadPoolException;
import com.sun.corba.se.spi.orbutil.threadpool.NoSuchWorkQueueException;
import com.sun.corba.se.spi.orbutil.threadpool.Work;

import com.sun.corba.se.impl.orbutil.ORBUtility;

public abstract class EventHandlerBase
    implements
        EventHandler
{
    protected ORB orb;
    protected Work work;
    protected boolean useWorkerThreadForEvent;
    protected boolean useSelectThreadToWait;
    protected SelectionKey selectionKey;

    ////////////////////////////////////////////////////
    //
    // EventHandler methods
    //

    public void setUseSelectThreadToWait(boolean x)
    {
        useSelectThreadToWait = x;
    }

    public boolean shouldUseSelectThreadToWait()
    {
        return useSelectThreadToWait;
    }

    public void setSelectionKey(SelectionKey selectionKey)
    {
        this.selectionKey = selectionKey;
    }

    public SelectionKey getSelectionKey()
    {
        return selectionKey;
    }

    /*
     * NOTE:
     * This is not thread-safe by design.
     * Only one thread should call it - a reader/listener/select thread.
     * Not stateless: interest ops, registration.
     */
    public void handleEvent()
    {
        if (orb.transportDebugFlag) {
            dprint(".handleEvent->: " + this);
        }
        getSelectionKey().interestOps(getSelectionKey().interestOps() &
                                      (~ getInterestOps()));
        if (shouldUseWorkerThreadForEvent()) {
            Throwable throwable = null;
            try {
                if (orb.transportDebugFlag) {
                    dprint(".handleEvent: addWork to pool: " + 0);
                }
                orb.getThreadPoolManager().getThreadPool(0)
                    .getWorkQueue(0).addWork(getWork());
            } catch (NoSuchThreadPoolException e) {
                throwable = e;
            } catch (NoSuchWorkQueueException e) {
                throwable = e;
            }
            // REVISIT: need to close connection.
            if (throwable != null) {
                if (orb.transportDebugFlag) {
                    dprint(".handleEvent: " + throwable);
                }
                INTERNAL i = new INTERNAL("NoSuchThreadPoolException");
                i.initCause(throwable);
                throw i;
            }
        } else {
            if (orb.transportDebugFlag) {
                dprint(".handleEvent: doWork");
            }
            getWork().doWork();
        }
        if (orb.transportDebugFlag) {
            dprint(".handleEvent<-: " + this);
        }
    }

    public boolean shouldUseWorkerThreadForEvent()
    {
        return useWorkerThreadForEvent;
    }

    public void setUseWorkerThreadForEvent(boolean x)
    {
        useWorkerThreadForEvent = x;
    }

    public void setWork(Work work)
    {
        this.work = work;
    }

    public Work getWork()
    {
        return work;
    }

    private void dprint(String msg)
    {
        ORBUtility.dprint("EventHandlerBase", msg);
    }
}

// End of file.

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