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cosEvent
Reference Manual
Version 2.1.12

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# CosEventChannelAdmin_ProxyPullSupplier

### MODULE

CosEventChannelAdmin_ProxyPullSupplier

### MODULE SUMMARY

This module implements a ProxyPullSupplier interface which acts as a middleman between pull consumer and the event channel.

### DESCRIPTION

The ProxyPullSupplier interface defines the second step for connecting pull consumers to the event channel. A proxy supplier is similar to a normal supplier, but includes an additional method for connecting a consumer to the proxy supplier.

To get access to all definitions, e.g., exceptions, include necessary hrl files by using:
-include_lib("cosEvent/include/*.hrl").

Any object that possesses an object reference that supports the ProxyPullSupplier interface can perform the following operations:

### EXPORTS

connect_pull_consumer(Object, PullConsumer) -> Return

Types:

Object = #objref
PullConsumer = #objref of PullConsumer type
Return = ok | {'EXCEPTION', #'CosEventChannelAdmin_AlreadyConnected'{}}

This operation connects PullConsumer object to the ProxyPullSupplier object. A nil object reference can be passed to this operation. If so a channel cannot invoke the disconnect_pull_consumer operation on the consumer; the consumer may be disconnected from the channel without being informed. If the ProxyPullSupplier is already connected to a PullConsumer, then the CosEventChannelAdmin_AlreadyConnected exception is raised.

disconnect_pull_supplier(Object) -> Return

Types:

Object = #objref
Return = ok

This operation disconnects proxy pull supplier from the event channel. It sends a notification about the loss of the connection to the pull consumer attached to it, unless nil object reference was passed at the connection time.

pull(Object) -> Return

Types:

Object = #objref
Return = any

This operation blocks until the event data is available or the CosEventComm_Disconnected exception is raised. It returns the event data to the consumer.

try_pull(Object) -> Return

Types:

Object = #objref
Return = {any, bool()}

This operation does not block: if the event data is available, it returns the event data and sets the data availability flag to true; otherwise it returns a long with an undefined value and sets the data availability to false. If the event communication has already been disconnected, the CosEventComm_Disconnected exception is raised.