ACE
6.4.2
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Reifies a method into a request. Subclasses typically represent necessary state and behavior. More...
#include <Activation_Queue.h>
Public Member Functions | |
ACE_Activation_Queue (ACE_Message_Queue< ACE_SYNCH > *new_queue=0, ACE_Allocator *alloc=0, ACE_Allocator *db_alloc=0) | |
Constructor. More... | |
virtual | ~ACE_Activation_Queue (void) |
Destructor. More... | |
ACE_Method_Request * | dequeue (ACE_Time_Value *tv=0) |
Dequeue the next available ACE_Method_Request. More... | |
int | enqueue (ACE_Method_Request *new_method_request, ACE_Time_Value *tv=0) |
Enqueue the ACE_Method_Request in priority order. More... | |
size_t | method_count (void) const |
Get the current number of method objects in the queue. More... | |
int | is_empty (void) const |
Returns 1 if the queue is empty, 0 otherwise. More... | |
int | is_full (void) const |
Returns 1 if the queue is full, 0 otherwise. More... | |
void | dump (void) const |
Dump the state of an request. More... | |
ACE_Message_Queue< ACE_SYNCH > * | queue (void) const |
Get a pointer to the underlying queue. More... | |
void | queue (ACE_Message_Queue< ACE_SYNCH > *q) |
Set the pointer to the underlying queue. More... | |
Public Attributes | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. More... | |
Protected Attributes | |
ACE_Message_Queue< ACE_SYNCH > * | queue_ |
Stores the Method_Requests. More... | |
bool | delete_queue_ |
Keeps track of whether we need to delete the queue. More... | |
Private Member Functions | |
void | operator= (const ACE_Activation_Queue &) |
ACE_Activation_Queue (const ACE_Activation_Queue &) | |
Private Attributes | |
ACE_Allocator * | allocator_ |
Allocation strategy of the queue. More... | |
ACE_Allocator * | data_block_allocator_ |
Allocation strategy of the message blocks. More... | |
Reifies a method into a request. Subclasses typically represent necessary state and behavior.
Maintains a priority-ordered queue of ACE_Method_Request objects. A scheduler class (often derived from ACE_Task) subsequently removes each method request and invokes its call()
method.
This class is discussed in depth in the Active Object chapter of POSA2. In that book, it is referred to as an Activation List.
ACE_Activation_Queue::ACE_Activation_Queue | ( | ACE_Message_Queue< ACE_SYNCH > * | new_queue = 0 , |
ACE_Allocator * | alloc = 0 , |
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ACE_Allocator * | db_alloc = 0 |
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Constructor.
Initializes a new activation queue.
new_queue | The activation queue uses an ACE_Message_Queue to queue and order the method requests. If this argument is 0, a new ACE_Message_Queue is created for this object's use and will be deleted when this object is destroyed. If a non-zero pointer is supplied, the passed object will be used and will not be deleted when this object is destroyed. If an ACE_Task is being created to act as the scheduler, for instance, its ACE_Message_Queue pointer can be passed to this object. |
alloc | Optional, the allocator to use when allocating ACE_Message_Block instances that wrap the method requests queued to this activation queue. Defaults to ACE_Allocator::instance(). |
db_alloc | Optional, the allocator to use when allocating data blocks for the ACE_Message_Block instances that wrap the method requests queued to this activation queue. Defaults to ACE_Allocator::instance(). |
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virtual |
Destructor.
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private |
ACE_Method_Request * ACE_Activation_Queue::dequeue | ( | ACE_Time_Value * | tv = 0 | ) |
Dequeue the next available ACE_Method_Request.
tv | If 0, the method will block until a method request is available, else will wait until the absolute time specified in the referenced ACE_Time_Value. This method will return, earlier, however, if queue is closed, deactivated, or when a signal occurs. |
Pointer | to the dequeued ACE_Method_Request object. |
0 | an error occurs; errno contains further information. If the specified timeout elapses, errno will be EWOULDBLOCK . |
void ACE_Activation_Queue::dump | ( | void | ) | const |
Dump the state of an request.
int ACE_Activation_Queue::enqueue | ( | ACE_Method_Request * | new_method_request, |
ACE_Time_Value * | tv = 0 |
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) |
Enqueue the ACE_Method_Request in priority order.
The priority of the method request is obtained via the priority()
method of the queued method request. Priority ordering is determined by the ACE_Message_Queue class; 0 is the lowest priority.
new_method_request | Pointer to the ACE_Method_Request object to queue. This object's priority() method is called to obtain the priority. |
tv | If 0, the method will block until the method request can be queued, else will wait until the absolute time specified in the referenced ACE_Time_Value. This method will return, earlier, however, if queue is closed, deactivated, or when a signal occurs. |
>0 | The number of method requests on the queue after adding the specified request. |
-1 | if an error occurs; errno contains further information. If the specified timeout elapses, errno will be EWOULDBLOCK . |
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inline |
Returns 1 if the queue is empty, 0 otherwise.
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inline |
Returns 1 if the queue is full, 0 otherwise.
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inline |
Get the current number of method objects in the queue.
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private |
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inline |
Get a pointer to the underlying queue.
void ACE_Activation_Queue::queue | ( | ACE_Message_Queue< ACE_SYNCH > * | q | ) |
Set the pointer to the underlying queue.
ACE_Activation_Queue::ACE_ALLOC_HOOK_DECLARE |
Declare the dynamic allocation hooks.
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private |
Allocation strategy of the queue.
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private |
Allocation strategy of the message blocks.
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protected |
Keeps track of whether we need to delete the queue.
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protected |
Stores the Method_Requests.