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ACE_Message_Queue_Base Class Reference

Base class for ACE_Message_Queue, which is the central queueing facility for messages in the ACE framework. More...

#include <Message_Queue.h>

Inheritance diagram for ACE_Message_Queue_Base:

Inheritance graph
[legend]
List of all members.

Public Types

enum  {
  DEFAULT_HWM = 16 * 1024, DEFAULT_LWM = 16 * 1024, WAS_ACTIVE = 1, ACTIVATED = 1,
  WAS_INACTIVE = 2, DEACTIVATED = 2, PULSED = 3
}

Public Member Functions

 ACE_Message_Queue_Base (void)
virtual int close (void)=0
 Close down the message queue and release all resources.

virtual ~ACE_Message_Queue_Base (void)
 Close down the message queue and release all resources.

virtual int peek_dequeue_head (ACE_Message_Block *&first_item, ACE_Time_Value *timeout=0)=0
virtual int enqueue_tail (ACE_Message_Block *new_item, ACE_Time_Value *timeout=0)=0
virtual int enqueue (ACE_Message_Block *new_item, ACE_Time_Value *timeout=0)=0
virtual int dequeue_head (ACE_Message_Block *&first_item, ACE_Time_Value *timeout=0)=0
virtual int dequeue (ACE_Message_Block *&first_item, ACE_Time_Value *timeout=0)=0
virtual int is_full (void)=0
 True if queue is full, else false.

virtual int is_empty (void)=0
 True if queue is empty, else false.

virtual size_t message_bytes (void)=0
virtual size_t message_length (void)=0
virtual size_t message_count (void)=0
 Number of total messages on the queue.

virtual void message_bytes (size_t new_size)=0
virtual void message_length (size_t new_length)=0
virtual int deactivate (void)=0
virtual int activate (void)=0
virtual int pulse (void)=0
virtual int state (void)
 Returns the current state of the queue.

virtual int deactivated (void)=0
virtual ACE_Notification_Strategy * notification_strategy (void)=0
 Get the notification strategy for the .

virtual void notification_strategy (ACE_Notification_Strategy *s)=0
 Set the notification strategy for the .

virtual void dump (void) const=0
 Dump the state of an object.


Public Attributes

 ACE_ALLOC_HOOK_DECLARE
 Declare the dynamic allocation hooks.


Protected Attributes

int state_

Private Member Functions

 ACE_Message_Queue_Base (const ACE_Message_Queue_Base &)
void operator= (const ACE_Message_Queue_Base &)

Detailed Description

Base class for ACE_Message_Queue, which is the central queueing facility for messages in the ACE framework.

For all the ACE_Time_Value pointer parameters the caller will block until action is possible if timeout == 0. Otherwise, it will wait until the absolute time specified in *timeout elapses.

A queue is always in one of three states: . ACTIVATED . DEACTIVATED . PULSED

Definition at line 52 of file Message_Queue.h.

Member Enumeration Documentation

anonymous enum
 

Enumeration values:
DEFAULT_HWM  Default high watermark (16 K).
DEFAULT_LWM  Default low watermark (same as high water mark).
WAS_ACTIVE 
Deprecated:
Use ACTIVATED instead.
ACTIVATED  Message queue is active and processing normally.
WAS_INACTIVE 
Deprecated:
Use DEACTIVATED instead.
DEACTIVATED  Queue is deactivated; no enqueue or dequeue operations allowed.
PULSED  Message queue was pulsed; enqueue and dequeue may proceed normally.

Definition at line 55 of file Message_Queue.h. 

00056   {
00057     // Default high and low watermarks.
00058 
00059     /// Default high watermark (16 K).
00060     DEFAULT_HWM = 16 * 1024,
00061     /// Default low watermark (same as high water mark).
00062     DEFAULT_LWM = 16 * 1024,
00063 
00064     // Queue states.  Before PULSED state was added, the activate()
00065     // and deactivate() methods returned WAS_INACTIVE or WAS_ACTIVE
00066     // to indicate the previous condition.  Now those methods
00067     // return the state the queue was previously in.  WAS_ACTIVE
00068     // and WAS_INACTIVE are defined to match previous semantics for
00069     // applications that don't use the PULSED state.
00070 
00071     /// @deprecated Use ACTIVATED instead.
00072     WAS_ACTIVE = 1,
00073     /// Message queue is active and processing normally
00074     ACTIVATED = 1,
00075 
00076     /// @deprecated Use DEACTIVATED instead.
00077     WAS_INACTIVE = 2,
00078     /// Queue is deactivated; no enqueue or dequeue operations allowed.
00079     DEACTIVATED = 2,
00080 
00081     /// Message queue was pulsed; enqueue and dequeue may proceed normally.
00082     PULSED = 3
00083 
00084   };

Constructor & Destructor Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE ACE_Message_Queue_Base::ACE_Message_Queue_Base (  void   ) 
 

Definition at line 12 of file Message_Queue.inl. 

00013 {
00014 }

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_Message_Queue_Base::~ACE_Message_Queue_Base (  void   )  [virtual]
 

Close down the message queue and release all resources.

Definition at line 18 of file Message_Queue.cpp. 

00019 {
00020 }

ACE_Message_Queue_Base::ACE_Message_Queue_Base (  const ACE_Message_Queue_Base &   )  [private]
 

Member Function Documentation

virtual int ACE_Message_Queue_Base::activate (  void   )  [pure virtual]
 

Reactivate the queue so that threads can enqueue and dequeue messages again.

Return values:
The queue's state before this call.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::close (  void   )  [pure virtual]
 

Close down the message queue and release all resources.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::deactivate (  void   )  [pure virtual]
 

Deactivate the queue and wake up all threads waiting on the queue so they can continue. No messages are removed from the queue, however. Any other operations called until the queue is activated again will immediately return -1 with errno ESHUTDOWN.

Return values:
The queue's state before this call.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::deactivated (  void   )  [pure virtual]
 

Returns 1 if the state of the queue is DEACTIVATED, and 0 if the queue's state is ACTIVATED or PULSED.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::dequeue (  ACE_Message_Block *&  first_item,
ACE_Time_Value *  timeout = 0
)  [pure virtual]
 

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::dequeue_head (  ACE_Message_Block *&  first_item,
ACE_Time_Value *  timeout = 0
)  [pure virtual]
 

Dequeue and return the <ACE_Message_Block *> at the head of the queue. Returns number of items in queue if the call succeeds or -1 otherwise. These calls return -1 when queue is closed, deactivated (in which case errno == ), when a signal occurs (in which case errno == , or if the time specified in timeout elapses (in which case errno == EWOULDBLOCK).

Implemented in ACE_Message_Queue<>, ACE_Dynamic_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual void ACE_Message_Queue_Base::dump (  void   )  const [pure virtual]
 

Dump the state of an object.

Implemented in ACE_Message_Queue<>, ACE_Dynamic_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::enqueue (  ACE_Message_Block *  new_item,
ACE_Time_Value *  timeout = 0
)  [pure virtual]
 

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::enqueue_tail (  ACE_Message_Block *  new_item,
ACE_Time_Value *  timeout = 0
)  [pure virtual]
 

Enqueue a <ACE_Message_Block *> into the tail of the queue. Returns number of items in queue if the call succeeds or -1 otherwise. These calls return -1 when queue is closed, deactivated (in which case errno == ), when a signal occurs (in which case errno == , or if the time specified in timeout elapses (in which case errno == EWOULDBLOCK).

Implemented in ACE_Message_Queue<>, ACE_Dynamic_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::is_empty (  void   )  [pure virtual]
 

True if queue is empty, else false.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::is_full (  void   )  [pure virtual]
 

True if queue is full, else false.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual void ACE_Message_Queue_Base::message_bytes (  size_t  new_size  )  [pure virtual]
 

New value of the number of total bytes on the queue, i.e., sum of the message block sizes.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual size_t ACE_Message_Queue_Base::message_bytes (  void   )  [pure virtual]
 

Number of total bytes on the queue, i.e., sum of the message block sizes.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual size_t ACE_Message_Queue_Base::message_count (  void   )  [pure virtual]
 

Number of total messages on the queue.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual void ACE_Message_Queue_Base::message_length (  size_t  new_length  )  [pure virtual]
 

New value of the number of total length on the queue, i.e., sum of the message block lengths.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual size_t ACE_Message_Queue_Base::message_length (  void   )  [pure virtual]
 

Number of total length on the queue, i.e., sum of the message block lengths.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual void ACE_Message_Queue_Base::notification_strategy (  ACE_Notification_Strategy *  s  )  [pure virtual]
 

Set the notification strategy for the .

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual ACE_Notification_Strategy* ACE_Message_Queue_Base::notification_strategy (  void   )  [pure virtual]
 

Get the notification strategy for the .

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

void ACE_Message_Queue_Base::operator= (  const ACE_Message_Queue_Base &   )  [private]
 

virtual int ACE_Message_Queue_Base::peek_dequeue_head (  ACE_Message_Block *&  first_item,
ACE_Time_Value *  timeout = 0
)  [pure virtual]
 

Retrieve the first ACE_Message_Block without removing it. Note that timeout uses <{absolute}> time rather than <{relative}> time. If the timeout elapses without receiving a message -1 is returned and errno is set to EWOULDBLOCK. If the queue is deactivated -1 is returned and errno is set to . Otherwise, returns -1 on failure, else the number of items still on the queue.

Implemented in ACE_Message_Queue<>, ACE_Dynamic_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

virtual int ACE_Message_Queue_Base::pulse (  void   )  [pure virtual]
 

Pulse the queue to wake up any waiting threads. Changes the queue state to PULSED; future enqueue/dequeue operations proceed as in ACTIVATED state.

Return values:
The queue's state before this call.

Implemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

int ACE_Message_Queue_Base::state (  void   )  [virtual]
 

Returns the current state of the queue.

Reimplemented in ACE_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

Definition at line 23 of file Message_Queue.cpp.

References ACE_TRACE, and state_. 

00024 {
00025   ACE_TRACE ("ACE_Message_Queue_Base::state");
00026 
00027   return this->state_;
00028 }

Member Data Documentation

ACE_Message_Queue_Base::ACE_ALLOC_HOOK_DECLARE
 

Declare the dynamic allocation hooks.

Reimplemented in ACE_Message_Queue<>, ACE_Dynamic_Message_Queue<>, ACE_Message_Queue< ACE_SYNCH >, and ACE_Message_Queue< ACE_SYNCH_USE >.

Definition at line 213 of file Message_Queue.h.

int ACE_Message_Queue_Base::state_ [protected]
 

Indicates the state of the queue, which can be , , or .

Definition at line 223 of file Message_Queue.h.

Referenced by state().

The documentation for this class was generated from the following files:
Generated on Sun Jan 27 12:55:51 2008 for ACE by doxygen 1.3.6