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package com.sun.jdi.event;
import com.sun.jdi.*;
Manager of incoming debugger events for a target VM. Events are always grouped in EventSet
s. EventSets generated by the debugger back end can be read here. There is one instance of EventQueue assigned to a particular VirtualMachine
. Some events cause the suspension of the target VM - event requests (request
) with a suspend policy
of SUSPEND_ALL
or
SUSPEND_EVENT_THREAD
and sometimes VMStartEvent
. If these suspensions are not resumed the target VM will hang. Thus, it is always good policy to remove()
every EventSet from the event queue until an EventSet containing a VMDisconnectEvent
is read. Unless resume
is being handled in another way, each EventSet should invoke EventSet.resume()
.
Author: Robert Field See Also: Since: 1.3
/**
* Manager of incoming debugger events for a target VM.
* Events are always grouped in {@link EventSet}s.
* EventSets generated by the debugger back end can be read
* here. There is one instance of EventQueue assigned to a particular
* {@link com.sun.jdi.VirtualMachine VirtualMachine}.
* <P>
* Some events cause the suspension of the target VM - event requests
* ({@link com.sun.jdi.request}) with a
* {@link com.sun.jdi.request.EventRequest#suspendPolicy() suspend policy}
* of {@link com.sun.jdi.request.EventRequest#SUSPEND_ALL SUSPEND_ALL}
* or {@link com.sun.jdi.request.EventRequest#SUSPEND_EVENT_THREAD
* SUSPEND_EVENT_THREAD} and sometimes
* {@link VMStartEvent}.
* If these suspensions are not resumed the target VM will hang.
* Thus, it is always good policy to
* {@link #remove() remove()} every EventSet from the
* event queue until an EventSet containing a
* {@link VMDisconnectEvent} is read.
* Unless {@link com.sun.jdi.VirtualMachine#resume() resume} is
* being handled in another way, each EventSet should invoke
* {@link EventSet#resume()}.
*
* @see EventSet
* @see VirtualMachine
*
* @author Robert Field
* @since 1.3
*/
public interface EventQueue extends Mirror {
Waits forever for the next available event.
Throws: - InterruptedException – if any thread has interrupted
this thread.
- VMDisconnectedException – if the connection to the target VM is no longer available. Note this will always be preceded by a
VMDisconnectEvent
.
Returns: the next EventSet
.
/**
* Waits forever for the next available event.
*
* @return the next {@link EventSet}.
* @throws InterruptedException if any thread has interrupted
* this thread.
* @throws com.sun.jdi.VMDisconnectedException if the connection
* to the target VM is no longer available. Note this will always
* be preceded by a {@link com.sun.jdi.event.VMDisconnectEvent}.
*/
EventSet remove() throws InterruptedException;
Waits a specified time for the next available event.
Params: - timeout – Time in milliseconds to wait for the next event
Throws: - InterruptedException – if any thread has interrupted
this thread.
- VMDisconnectedException – if the connection to the target VM is no longer available. Note this will always be preceded by a
VMDisconnectEvent
. - IllegalArgumentException – if the timeout argument
contains an illegal value.
Returns: the next EventSet
, or null if there is a timeout.
/**
* Waits a specified time for the next available event.
*
* @param timeout Time in milliseconds to wait for the next event
* @return the next {@link EventSet}, or null if there is a timeout.
* @throws InterruptedException if any thread has interrupted
* this thread.
* @throws com.sun.jdi.VMDisconnectedException if the connection
* to the target VM is no longer available. Note this will always
* be preceded by a {@link com.sun.jdi.event.VMDisconnectEvent}.
* @throws IllegalArgumentException if the timeout argument
* contains an illegal value.
*/
EventSet remove(long timeout) throws InterruptedException;
}