mirror of git://gcc.gnu.org/git/gcc.git
300 lines
9.9 KiB
Java
300 lines
9.9 KiB
Java
/* EventManager.java -- event management and notification infrastructure
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Copyright (C) 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp.event;
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import gnu.classpath.jdwp.VMVirtualMachine;
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import gnu.classpath.jdwp.exception.InvalidEventTypeException;
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import gnu.classpath.jdwp.exception.JdwpException;
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import java.util.Collection;
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import java.util.Hashtable;
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import java.util.Iterator;
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/**
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* Manages event requests and filters event notifications.
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*
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* The purpose of this class is actually two-fold:
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*
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* 1) Maintain a list of event requests from the debugger
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* 2) Filter event notifications from the VM
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*
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* If an event request arrives from the debugger, the back-end will
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* call {@link #reqestEvent}, which will first check for a valid event.
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* If it is valid, <code>EventManager</code> will record the request
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* internally and register the event with the virtual machine, which may
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* choose to handle the request itself (as is likely the case with
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* breakpoints and other execution-related events), or it may decide to
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* allow the <code>EventManager</code> to handle notifications and all
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* filtering (which is convenient for other events such as class (un)loading).
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*
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* @author Keith Seitz (keiths@redhat.com)
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*/
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public class EventManager
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{
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// Single instance
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private static EventManager _instance = new EventManager ();
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// maps event (EVENT_*) to lists of EventRequests
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private Hashtable _requests = null;
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/**
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* Returns an instance of the event manager
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*
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* @return the event manager
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*/
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public static EventManager getDefault ()
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{
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return _instance;
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}
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// Private constructs a new <code>EventManager</code>
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private EventManager ()
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{
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_requests = new Hashtable ();
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// Add lists for all the event types
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_requests.put (new Byte (EventRequest.EVENT_SINGLE_STEP),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_BREAKPOINT),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_FRAME_POP),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_EXCEPTION),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_USER_DEFINED),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_THREAD_START),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_THREAD_END),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_CLASS_PREPARE),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_CLASS_UNLOAD),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_CLASS_LOAD),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_FIELD_ACCESS),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_FIELD_MODIFY),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_METHOD_ENTRY),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_METHOD_EXIT),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_VM_INIT),
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new Hashtable ());
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_requests.put (new Byte (EventRequest.EVENT_VM_DEATH),
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new Hashtable ());
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// Add auto-generated event notifications
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// only two: VM_INIT, VM_DEATH
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try
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{
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requestEvent (new EventRequest (0,
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EventRequest.EVENT_VM_INIT,
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EventRequest.SUSPEND_NONE));
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requestEvent (new EventRequest (0,
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EventRequest.EVENT_VM_DEATH,
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EventRequest.SUSPEND_NONE));
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}
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catch (JdwpException e)
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{
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// This can't happen
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}
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}
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/**
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* Returns a request for the given event. This method will only
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* be used if the <code>EventManager</code> is handling event filtering.
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*
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* @param event the event
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* @return request that was interested in this event
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* or <code>null</code> if none (and event should not be sent)
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* @throws IllegalArgumentException for invalid event kind
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*/
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public EventRequest getEventRequest (Event event)
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{
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EventRequest interestedRequest = null;
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Hashtable requests;
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Byte kind = new Byte (event.getEventKind ());
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requests = (Hashtable) _requests.get (kind);
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if (requests == null)
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{
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// Did not get a valid event type
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throw new IllegalArgumentException ("invalid event kind: " + kind);
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}
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boolean match = false;
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// Loop through the requests. Must look at ALL requests in order
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// to evaluate all filters (think count filter).
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// TODO: What if multiple matches? Spec isn't so clear on this.
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Iterator rIter = requests.values().iterator ();
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while (rIter.hasNext ())
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{
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EventRequest request = (EventRequest) rIter.next ();
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if (request.matches (event))
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interestedRequest = request;
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}
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return interestedRequest;
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}
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/**
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* Requests monitoring of an event.
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*
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* The debugger registers for event notification through
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* an event filter. If no event filter is specified for an event
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* in the VM, it is assumed that the debugger is not interested in
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* receiving notifications of this event.
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*
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* The virtual machine will be notified of the request.
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*
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* @param request the request to monitor
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* @throws InvalidEventTypeException for invalid event kind
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* @throws JdwpException for other errors involving request
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*/
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public void requestEvent (EventRequest request)
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throws JdwpException
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{
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// Add request to request list
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Hashtable requests;
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Byte kind = new Byte (request.getEventKind ());
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requests = (Hashtable) _requests.get (kind);
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if (requests == null)
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{
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// Did not get a valid event type
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throw new InvalidEventTypeException (request.getEventKind ());
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}
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// Register the event with the VM
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VMVirtualMachine.registerEvent (request);
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requests.put (new Integer (request.getId ()), request);
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}
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/**
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* Deletes the given request from the management table
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*
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* @param kind the event kind
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* @param id the ID of the request to delete
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* @throws IllegalArgumentException for invalid event kind
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* @throws JdwpException for other errors deleting request
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*/
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public void deleteRequest (byte kind, int id)
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throws JdwpException
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{
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Hashtable requests;
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requests = (Hashtable) _requests.get (new Byte (kind));
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if (requests == null)
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{
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// Did not get a valid event type
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throw new IllegalArgumentException ("invalid event kind: " + kind);
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}
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Integer iid = new Integer (id);
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EventRequest request = (EventRequest) requests.get (iid);
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if (request != null)
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{
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VMVirtualMachine.unregisterEvent (request);
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requests.remove (iid);
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}
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}
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/**
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* Clears all the requests for a given event
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*
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* @param kind the event kind
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* @throws IllegalArgumentException for invalid event kind
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* @throws JdwpException for error clearing events
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*/
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public void clearRequests (byte kind)
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throws JdwpException
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{
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Hashtable requests = (Hashtable) _requests.get (new Byte (kind));
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if (requests == null)
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{
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// Did not get a valid event type
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throw new IllegalArgumentException ("invalid event kind: " + kind);
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}
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VMVirtualMachine.clearEvents (kind);
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requests.clear ();
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}
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/**
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* Returns a given event request for an event
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*
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* @param kind the kind of event for the request
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* @param id the integer request id to return
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* @return the request for the given event kind with the given id
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* (or <code>null</code> if not found)
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* @throws IllegalArgumentException for invalid event kind
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*/
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public EventRequest getRequest (byte kind, int id)
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{
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Hashtable requests = (Hashtable) _requests.get (new Byte (kind));
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if (requests == null)
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{
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// Did not get a valid event type
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throw new IllegalArgumentException ("invalid event kind: " + kind);
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}
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return (EventRequest) requests.get (new Integer (id));
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}
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/**
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* Returns all requests of the given event kind
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*
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* @param kind the event kind
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* @returns a <code>Collection</code> of all the registered requests
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* @throws IllegalArgumentException for invalid event kind
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*/
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public Collection getRequests (byte kind)
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{
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Hashtable requests = (Hashtable) _requests.get (new Byte (kind));
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if (requests == null)
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{
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// Did not get a valid event type
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throw new IllegalArgumentException ("invalid event kind: " + kind);
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}
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return requests.values ();
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}
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}
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