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  /*
   *  Copyright (C) 2010-2011 Oracle Corporation
   *
   *  This file is part of the VirtualBox SDK, as available from
   *  http://www.virtualbox.org.  This library is free software; you can
   *  redistribute it and/or modify it under the terms of the GNU Lesser General
   *  Public License as published by the Free Software Foundation, in version 2.1
   *  as it comes in the "COPYING.LIB" file of the VirtualBox SDK distribution.
  *  This library 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 Lesser General Public
  *  License for more details.
  *
  * IEvent.java
  *
  * DO NOT EDIT! This is a generated file.
  * Generated from: src/VBox/Main/idl/VirtualBox.xidl (VirtualBox's interface definitions in XML)
  * Generator: src/VBox/Main/glue/glue-java.xsl
  */
 
 package org.virtualbox_4_2;
 
 import javax.xml.ws.*;
 import java.util.List;

Abstract parent interface for VirtualBox events. Actual events will typically implement a more specific interface which derives from this (see below). Introduction to VirtualBox events Generally speaking, an event (represented by this interface) signals that something happened, while an event listener (see IEventListener) represents an entity that is interested in certain events. In order for this to work with unidirectional protocols (i.e. web services), the concepts of passive and active listener are used. Event consumers can register themselves as listeners, providing an array of events they are interested in (see IEventSource.registerListener(org.virtualbox_4_2.IEventListener,java.util.List,java.lang.Boolean)). When an event triggers, the listener is notified about the event. The exact mechanism of the notification depends on whether the listener was registered as an active or passive listener:
  • An active listener is very similar to a callback: it is a function invoked by the API. As opposed to the callbacks that were used in the API before VirtualBox 4.0 however, events are now objects with an interface hierarchy.
  • Passive listeners are somewhat trickier to implement, but do not require a client function to be callable, which is not an option with scripting languages or web service clients. Internally the IEventSource implementation maintains an event queue for each passive listener, and newly arrived events are put in this queue. When the listener calls IEventSource.getEvent(org.virtualbox_4_2.IEventListener,java.lang.Integer), first element from its internal event queue is returned. When the client completes processing of an event, the IEventSource.eventProcessed(org.virtualbox_4_2.IEventListener,org.virtualbox_4_2.IEvent) function must be called, acknowledging that the event was processed. It supports implementing waitable events. On passive listener unregistration, all events from its queue are auto-acknowledged.
Waitable events are useful in situations where the event generator wants to track delivery or a party wants to wait until all listeners have completed the event. A typical example would be a vetoable event (see IVetoEvent) where a listeners might veto a certain action, and thus the event producer has to make sure that all listeners have processed the event and not vetoed before taking the action. A given event may have both passive and active listeners at the same time. Using events Any VirtualBox object capable of producing externally visible events provides an eventSource read-only attribute, which is of the type IEventSource. This event source object is notified by VirtualBox once something has happened, so consumers may register event listeners with this event source. To register a listener, an object implementing the IEventListener interface must be provided. For active listeners, such an object is typically created by the consumer, while for passive listeners IEventSource.createListener() should be used. Please note that a listener created with IEventSource.createListener() must not be used as an active listener. Once created, the listener must be registered to listen for the desired events (see IEventSource.registerListener(org.virtualbox_4_2.IEventListener,java.util.List,java.lang.Boolean)), providing an array of VBoxEventType enums. Those elements can either be the individual event IDs or wildcards matching multiple event IDs. After registration, the callback's IEventListener.handleEvent(org.virtualbox_4_2.IEvent) method is called automatically when the event is triggered, while passive listeners have to call IEventSource.getEvent(org.virtualbox_4_2.IEventListener,java.lang.Integer) and IEventSource.eventProcessed(org.virtualbox_4_2.IEventListener,org.virtualbox_4_2.IEvent) in an event processing loop. The IEvent interface is an abstract parent interface for all such VirtualBox events coming in. As a result, the standard use pattern inside IEventListener.handleEvent(org.virtualbox_4_2.IEvent) or the event processing loop is to check the getType() attribute of the event and then cast to the appropriate specific interface using QueryInterface(). Interface ID: {0CA2ADBA-8F30-401B-A8CD-FE31DBE839C0}
 
public class IEvent extends IUnknown {
    public IEvent(String wrappedVboxPortType port) {
          super(wrappedport);
    }
Event type.

Returns:
org.virtualbox_4_2.VBoxEventType
      try {
         return org.virtualbox_4_2.VBoxEventType.fromValue(retVal.value());
     } catch (InvalidObjectFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     } catch (RuntimeFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     }
    }
Source of this event.

Returns:
org.virtualbox_4_2.IEventSource
      try {
         String retVal = .iEventGetSource();
         return (retVal.length() > 0) ? new org.virtualbox_4_2.IEventSource(retVal) : null;
     } catch (InvalidObjectFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     } catch (RuntimeFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     }
    }
If we can wait for this event being processed. If false, waitProcessed(java.lang.Integer) returns immediately, and setProcessed() doesn't make sense. Non-waitable events are generally better performing, as no additional overhead associated with waitability imposed. Waitable events are needed when one need to be able to wait for particular event processed, for example for vetoable changes, or if event refers to some resource which need to be kept immutable until all consumers confirmed events.

Returns:
Boolean
    public Boolean getWaitable() {
      try {
         Boolean retVal = .iEventGetWaitable();
         return retVal;
     } catch (InvalidObjectFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     } catch (RuntimeFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     }
    }
    public static IEvent queryInterface(IUnknown obj) {
       return obj == null ?  null : new IEvent(obj.getWrapped(), obj.getRemoteWSPort());
    }
Internal method called by the system when all listeners of a particular event have called IEventSource.eventProcessed(org.virtualbox_4_2.IEventListener,org.virtualbox_4_2.IEvent). This should not be called by client code.
    public void setProcessed() {
      try {
        .iEventSetProcessed();
     } catch (InvalidObjectFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     } catch (RuntimeFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     }
    }
Wait until time outs, or this event is processed. Event must be waitable for this operation to have described semantics, for non-waitable returns true immediately.

Parameters:
timeout Maximum time to wait for event processeing, in ms; 0 = no wait, -1 = indefinite wait.
Returns:
If this event was processed before timeout.
    public Boolean waitProcessed(Integer timeout) {
      try {
        Boolean     retVal;
        retVal = .iEventWaitProcessed(timeout);
        return retVal;
     } catch (InvalidObjectFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     } catch (RuntimeFaultMsg e) {
          throw new VBoxException(ee.getMessage());
     }
    }
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