org.javagroups.protocols
Class QUEUE
java.lang.Object
|
+--org.javagroups.stack.Protocol
|
+--org.javagroups.protocols.QUEUE
- public class QUEUE
- extends Protocol
Queuing layer. Upon reception of event START_QUEUEING, all events traveling through
this layer upwards/downwards (depending on direction of event) will be queued. Upon
reception of a STOP_QUEUEING event, all events will be released. Finally, the
queueing flag is reset.
When queueing, only event STOP_QUEUEING (received up or downwards) will be allowed
to release queueing.
Fields inherited from class org.javagroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, observer, props, stack, up_handler, up_prot, up_queue, up_thread |
Constructor Summary |
QUEUE()
|
Methods inherited from class org.javagroups.stack.Protocol |
getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, init, passDown, passUp, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, startDownHandler, startUpHandler, stopInternal |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
QUEUE
public QUEUE()
setObserver
public void setObserver(QUEUE.Observer observer)
- Only 1 observer is allowed. More than one might slow down the system. Will be called
when an event is queued (up or down)
getUpVector
public java.util.Vector getUpVector()
getDownVector
public java.util.Vector getDownVector()
getQueueingUp
public boolean getQueueingUp()
getQueueingDown
public boolean getQueueingDown()
getName
public java.lang.String getName()
- All protocol names have to be unique !
- Overrides:
getName
in class Protocol
providedUpServices
public java.util.Vector providedUpServices()
- Description copied from class:
Protocol
- List of events that are provided to layers above (they will be handled when sent down from
above).
- Overrides:
providedUpServices
in class Protocol
- Following copied from class:
org.javagroups.stack.Protocol
- Returns:
- Vector (of Integers)
providedDownServices
public java.util.Vector providedDownServices()
- Description copied from class:
Protocol
- List of events that are provided to layers below (they will be handled when sent down from
below).
- Overrides:
providedDownServices
in class Protocol
- Following copied from class:
org.javagroups.stack.Protocol
- Returns:
- Vector (of Integers)
setProperties
public boolean setProperties(java.util.Properties props)
- Description copied from class:
Protocol
- Configures the protocol initially. A configuration string consists of name=value
items, separated by a ';' (semicolon), e.g.:
"loopback=false;unicast_inport=4444"
- Overrides:
setProperties
in class Protocol
up
public void up(Event evt)
- Queues or passes up events. No queue sync. necessary, as this method is never called
concurrently.
- Overrides:
up
in class Protocol
down
public void down(Event evt)
- Description copied from class:
Protocol
- An event is to be sent down the stack. The layer may want to examine its type and perform
some action on it, depending on the event's type. If the event is a message MSG, then
the layer may need to add a header to it (or do nothing at all) before sending it down
the stack using
passDown()
. In case of a GET_ADDRESS event (which tries to
retrieve the stack's address from one of the bottom layers), the layer may need to send
a new response event back up the stack using passUp()
.
- Overrides:
down
in class Protocol
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