/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
package com.sun.tools.example.debug.bdi;
import com.sun.jdi.VirtualMachine;
import com.sun.jdi.VMDisconnectedException;
/**
* Our repository of what we know about the state of one
* running VM.
*/
class Session {
final VirtualMachine vm;
final ExecutionManager runtime;
final OutputListener diagnostics;
boolean running = true; // Set false by JDIEventSource
boolean interrupted = false; // Set false by JDIEventSource
private JDIEventSource eventSourceThread = null;
private int traceFlags;
private boolean dead = false;
public Session(VirtualMachine vm, ExecutionManager runtime,
OutputListener diagnostics) {
this.vm = vm;
this.runtime = runtime;
this.diagnostics = diagnostics;
this.traceFlags = VirtualMachine.TRACE_NONE;
}
/**
* Determine if VM is interrupted, i.e, present and not running.
*/
public boolean isInterrupted() {
return interrupted;
}
public void setTraceMode(int traceFlags) {
this.traceFlags = traceFlags;
if (!dead) {
vm.setDebugTraceMode(traceFlags);
}
}
public boolean attach() {
vm.setDebugTraceMode(traceFlags);
diagnostics.putString("Connected to VM");
eventSourceThread = new JDIEventSource(this);
eventSourceThread.start();
return true;
}
public void detach() {
if (!dead) {
eventSourceThread.interrupt();
eventSourceThread = null;
//### The VM may already be disconnected
//### if the debuggee did a System.exit().
//### Exception handler here is a kludge,
//### Rather, there are many other places
//### where we need to handle this exception,
//### and initiate a detach due to an error
//### condition, e.g., connection failure.
try {
vm.dispose();
} catch (VMDisconnectedException ee) {}
dead = true;
diagnostics.putString("Disconnected from VM");
}
}
}