/*

 * Copyright (c) 1998, 2017, 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.tools.jdi;

import com.sun.jdi.ClassNotPreparedException;

import com.sun.jdi.InconsistentDebugInfoException;

import com.sun.jdi.ObjectCollectedException;

import com.sun.jdi.VMDisconnectedException;

import com.sun.jdi.VMOutOfMemoryException;

import com.sun.jdi.VirtualMachine;

import com.sun.jdi.event.ClassPrepareEvent;

import com.sun.jdi.event.ClassUnloadEvent;

import com.sun.jdi.event.Event;

import com.sun.jdi.event.EventIterator;

import com.sun.jdi.event.EventSet;

public class InternalEventHandler implements Runnable

{

    EventQueueImpl queue;

    VirtualMachineImpl vm;

    InternalEventHandler(VirtualMachineImpl vm, EventQueueImpl queue) {

        this.vm = vm;

        this.queue = queue;

        Thread thread = new Thread(vm.threadGroupForJDI(), this,

                                   "JDI Internal Event Handler");

        thread.setDaemon(true);

        thread.start();

    }

    public void run() {

        if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {

            vm.printTrace("Internal event handler running");

        }

        try {

            while (true) {

                try {

                    EventSet eventSet = queue.removeInternal();

                    EventIterator it = eventSet.eventIterator();

                    while (it.hasNext()) {

                        Event event = it.nextEvent();

                        if (event instanceof ClassUnloadEvent) {

                            ClassUnloadEvent cuEvent = (ClassUnloadEvent)event;

                            vm.removeReferenceType(cuEvent.classSignature());

                            if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {

                                vm.printTrace("Handled Unload Event for " +

                                              cuEvent.classSignature());

                            }

                        } else if (event instanceof ClassPrepareEvent) {

                            ClassPrepareEvent cpEvent = (ClassPrepareEvent)event;

                            ((ReferenceTypeImpl)cpEvent.referenceType())

                                                            .markPrepared();

                            if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {

                                vm.printTrace("Handled Prepare Event for " +

                                              cpEvent.referenceType().name());

                            }

                        }

                    }

                /*

                 * Handle exceptions that can occur in normal operation

                 * but which can't be accounted for by event builder

                 * methods. The thread should not be terminated if they

                 * occur.

                 *

                 * TO DO: We need a better way to log these conditions.

                 */

                } catch (VMOutOfMemoryException vmme) {

                    vmme.printStackTrace();

                } catch (InconsistentDebugInfoException idie) {

                    idie.printStackTrace();

                /*

                 * If any of these exceptions below occurs, there is some

                 * sort of programming error that should be addressed in

                 * the JDI implemementation. However, it would cripple

                 * the implementation if we let this thread die due to

                 * one of them. So, a notification of the exception is

                 * given and we attempt to continue.

                 */

                } catch (ObjectCollectedException oce) {

                    oce.printStackTrace();

                } catch (ClassNotPreparedException cnpe) {

                    cnpe.printStackTrace();

                }

            }

        } catch (InterruptedException e) {  // should we really die here

        } catch (VMDisconnectedException e) {  // time to die

        }

        if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {

            vm.printTrace("Internal event handler exiting");

        }

    }

}