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/*
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* Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.jdi;
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import com.sun.jdi.*;
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import com.sun.jdi.event.*;
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import com.sun.jdi.connect.spi.Connection;
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import com.sun.jdi.event.EventSet;
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import java.util.*;
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import java.io.IOException;
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public class TargetVM implements Runnable {
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private Map<String, Packet> waitingQueue = new HashMap<String, Packet>(32,0.75f);
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private boolean shouldListen = true;
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private List<EventQueue> eventQueues = Collections.synchronizedList(new ArrayList<EventQueue>(2));
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private VirtualMachineImpl vm;
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private Connection connection;
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private Thread readerThread;
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private EventController eventController = null;
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private boolean eventsHeld = false;
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/*
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* TO DO: The limit numbers below are somewhat arbitrary and should
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* be configurable in the future.
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*/
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static private final int OVERLOADED_QUEUE = 2000;
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static private final int UNDERLOADED_QUEUE = 100;
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TargetVM(VirtualMachineImpl vm, Connection connection) {
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this.vm = vm;
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this.connection = connection;
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this.readerThread = new Thread(vm.threadGroupForJDI(),
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this, "JDI Target VM Interface");
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this.readerThread.setDaemon(true);
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}
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void start() {
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readerThread.start();
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}
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private void dumpPacket(Packet packet, boolean sending) {
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String direction = sending ? "Sending" : "Receiving";
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if (sending) {
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vm.printTrace(direction + " Command. id=" + packet.id +
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", length=" + packet.data.length +
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", commandSet=" + packet.cmdSet +
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", command=" + packet.cmd +
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", flags=" + packet.flags);
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} else {
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String type = (packet.flags & Packet.Reply) != 0 ?
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"Reply" : "Event";
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vm.printTrace(direction + " " + type + ". id=" + packet.id +
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", length=" + packet.data.length +
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", errorCode=" + packet.errorCode +
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", flags=" + packet.flags);
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}
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StringBuffer line = new StringBuffer(80);
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line.append("0000: ");
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for (int i = 0; i < packet.data.length; i++) {
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if ((i > 0) && (i % 16 == 0)) {
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vm.printTrace(line.toString());
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line.setLength(0);
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line.append(String.valueOf(i));
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line.append(": ");
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int len = line.length();
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for (int j = 0; j < 6 - len; j++) {
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line.insert(0, '0');
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}
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}
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int val = 0xff & packet.data[i];
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String str = Integer.toHexString(val);
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if (str.length() == 1) {
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line.append('0');
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}
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line.append(str);
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line.append(' ');
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}
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if (line.length() > 6) {
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vm.printTrace(line.toString());
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}
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}
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public void run() {
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if ((vm.traceFlags & VirtualMachine.TRACE_SENDS) != 0) {
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vm.printTrace("Target VM interface thread running");
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}
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Packet p=null,p2;
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String idString;
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while(shouldListen) {
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boolean done = false;
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try {
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byte b[] = connection.readPacket();
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if (b.length == 0) {
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done = true;
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}
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p = Packet.fromByteArray(b);
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} catch (IOException e) {
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done = true;
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}
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if (done) {
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shouldListen = false;
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try {
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connection.close();
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} catch (IOException ioe) { }
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break;
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}
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if ((vm.traceFlags & VirtualMachineImpl.TRACE_RAW_RECEIVES) != 0) {
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dumpPacket(p, false);
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}
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if((p.flags & Packet.Reply) == 0) {
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// It's a command
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handleVMCommand(p);
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} else {
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/*if(p.errorCode != Packet.ReplyNoError) {
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System.err.println("Packet " + p.id + " returned failure = " + p.errorCode);
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}*/
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vm.state().notifyCommandComplete(p.id);
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idString = String.valueOf(p.id);
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synchronized(waitingQueue) {
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p2 = waitingQueue.get(idString);
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if (p2 != null)
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waitingQueue.remove(idString);
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}
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if(p2 == null) {
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// Whoa! a reply without a sender. Problem.
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// FIX ME! Need to post an error.
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System.err.println("Recieved reply with no sender!");
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continue;
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}
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p2.errorCode = p.errorCode;
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p2.data = p.data;
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p2.replied = true;
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synchronized(p2) {
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p2.notify();
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}
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}
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}
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// inform the VM mamager that this VM is history
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vm.vmManager.disposeVirtualMachine(vm);
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// close down all the event queues
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// Closing a queue causes a VMDisconnectEvent to
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// be put onto the queue.
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synchronized(eventQueues) {
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Iterator iter = eventQueues.iterator();
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while (iter.hasNext()) {
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((EventQueueImpl)iter.next()).close();
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}
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}
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// indirectly throw VMDisconnectedException to
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// command requesters.
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synchronized(waitingQueue) {
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Iterator iter = waitingQueue.values().iterator();
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while (iter.hasNext()) {
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Packet packet = (Packet)iter.next();
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synchronized(packet) {
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packet.notify();
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}
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}
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waitingQueue.clear();
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}
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if ((vm.traceFlags & VirtualMachine.TRACE_SENDS) != 0) {
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vm.printTrace("Target VM interface thread exiting");
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}
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}
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protected void handleVMCommand(Packet p) {
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switch (p.cmdSet) {
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case JDWP.Event.COMMAND_SET:
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handleEventCmdSet(p);
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break;
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default:
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System.err.println("Ignoring cmd " + p.id + "/" +
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p.cmdSet + "/" + p.cmd + " from the VM");
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return;
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}
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}
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/* Events should not be constructed on this thread (the thread
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* which reads all data from the transport). This means that the
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* packet cannot be converted to real JDI objects as that may
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* involve further communications with the back end which would
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* deadlock.
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*
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* Instead the whole packet is passed for lazy eval by a queue
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* reading thread.
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*/
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protected void handleEventCmdSet(Packet p) {
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EventSet eventSet = new EventSetImpl(vm, p);
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if (eventSet != null) {
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queueEventSet(eventSet);
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}
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}
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private EventController eventController() {
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if (eventController == null) {
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eventController = new EventController(vm);
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}
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return eventController;
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}
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private synchronized void controlEventFlow(int maxQueueSize) {
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if (!eventsHeld && (maxQueueSize > OVERLOADED_QUEUE)) {
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eventController().hold();
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eventsHeld = true;
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} else if (eventsHeld && (maxQueueSize < UNDERLOADED_QUEUE)) {
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eventController().release();
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eventsHeld = false;
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}
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}
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void notifyDequeueEventSet() {
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int maxQueueSize = 0;
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synchronized(eventQueues) {
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Iterator iter = eventQueues.iterator();
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while (iter.hasNext()) {
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EventQueueImpl queue = (EventQueueImpl)iter.next();
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maxQueueSize = Math.max(maxQueueSize, queue.size());
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}
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}
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controlEventFlow(maxQueueSize);
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}
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private void queueEventSet(EventSet eventSet) {
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int maxQueueSize = 0;
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synchronized(eventQueues) {
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Iterator iter = eventQueues.iterator();
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while (iter.hasNext()) {
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EventQueueImpl queue = (EventQueueImpl)iter.next();
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queue.enqueue(eventSet);
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maxQueueSize = Math.max(maxQueueSize, queue.size());
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}
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}
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controlEventFlow(maxQueueSize);
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}
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void send(Packet packet) {
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String id = String.valueOf(packet.id);
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synchronized(waitingQueue) {
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waitingQueue.put(id, packet);
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}
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if ((vm.traceFlags & VirtualMachineImpl.TRACE_RAW_SENDS) != 0) {
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dumpPacket(packet, true);
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}
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try {
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connection.writePacket(packet.toByteArray());
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} catch (IOException e) {
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throw new VMDisconnectedException(e.getMessage());
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}
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}
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void waitForReply(Packet packet) {
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synchronized(packet) {
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while ((!packet.replied) && shouldListen) {
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try { packet.wait(); } catch (InterruptedException e) {;}
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}
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if (!packet.replied) {
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throw new VMDisconnectedException();
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}
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}
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}
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void addEventQueue(EventQueueImpl queue) {
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if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
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vm.printTrace("New event queue added");
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}
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eventQueues.add(queue);
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}
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void stopListening() {
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if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
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vm.printTrace("Target VM i/f closing event queues");
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}
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shouldListen = false;
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try {
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connection.close();
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} catch (IOException ioe) { }
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}
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static private class EventController extends Thread {
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VirtualMachineImpl vm;
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int controlRequest = 0;
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EventController(VirtualMachineImpl vm) {
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super(vm.threadGroupForJDI(), "JDI Event Control Thread");
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this.vm = vm;
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setDaemon(true);
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setPriority((MAX_PRIORITY + NORM_PRIORITY)/2);
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super.start();
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}
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synchronized void hold() {
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controlRequest++;
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notifyAll();
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}
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synchronized void release() {
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controlRequest--;
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notifyAll();
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}
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public void run() {
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while(true) {
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int currentRequest;
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synchronized(this) {
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while (controlRequest == 0) {
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try {wait();} catch (InterruptedException e) {}
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}
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currentRequest = controlRequest;
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controlRequest = 0;
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}
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try {
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if (currentRequest > 0) {
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JDWP.VirtualMachine.HoldEvents.process(vm);
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} else {
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JDWP.VirtualMachine.ReleaseEvents.process(vm);
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}
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} catch (JDWPException e) {
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/*
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* Don't want to terminate the thread, so the
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* stack trace is printed and we continue.
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*/
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e.toJDIException().printStackTrace(System.err);
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}
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}
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}
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}
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}
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