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The EventChannel interface supplies three operations Consumers that want to connect to an event channel invoke its for_consumers operation, which returns a ConsumerAdmin object reference Suppliers that want to connect to an event channel invoke its for_suppliers operation, which returns a SupplierAdmin object reference Invoking destroy on an event channel permanently destroys it, including any events that it has not yet delivered Moreover, destroying the event channel also destroys all administrative objects created by that channel and all proxy objects created by those administrative objects Any connected consumers and suppliers are notified when their channel is destroyed After invoking for_consumers on an event channel, the consumer must decide whether it wants to use the push model or the pull model If it wants to be a push consumer, it invokes the obtain_push_supplier operation on the ConsumerAdmin object returned from for_consumers Otherwise, it invokes obtain_pull_supplier Similarly, suppliers must decide whether they want to support the push or pull model, so they can invoke the appropriate operation on the SupplierAdmin returned from EventChannel::for_suppliers
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Establishing Push Model Connections
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A consumer that wants to register as a push consumer first obtains a ProxyPushSupplier object reference by invoking obtain_push_supplier on a ConsumerAdmin object Similarly, a supplier that wants to push events first obtains a ProxyPushConsumer by invoking SupplierAdmin::obtain_push_consumer These proxy interfaces are shown next
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module CosEventChannelAdmin { exception AlreadyConnected {}; exception TypeError {}; interface ProxyPushSupplier : CosEventComm::PushSupplier { void connect_push_consumer( in CosEventComm::PushConsumer push_consumer ) raises(AlreadyConnected, TypeError); }; interface ProxyPushConsumer : CosEventComm::PushConsumer { void connect_push_supplier( in CosEventComm::PushSupplier push_supplier ) raises(AlreadyConnected); }; //
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The ProxyPushSupplier interface inherits the CosEventComm:: PushSupplier interface, and ProxyPushConsumer inherits CosEventComm::PushConsumer These base interfaces are described in Section 2051 These derived interfaces supply operations that allow consumers and suppliers, respectively, to establish connections to an event channel A push consumer invokes connect_push_consumer on a ProxyPushSupplier in order to establish a connection to its PushConsumer object Similarly, a push supplier invokes connect_push_supplier on a ProxyPushConsumer in order to connect itself A consumer invoking connect_push_consumer passes an object reference for its PushConsumer object By invoking push on this object reference, the supplier delivers events to the consumer As described in Section 2051, the supplier can also invoke the disconnect_push_consumer to disconnect the consumer from the channel A supplier calls connect_push_supplier to make itself known to the target proxy push consumer If it is interested in having the proxy push consumer notify it when it is about to be disconnected, it can pass a non-nil PushSupplier object reference as an argument Otherwise, it must pass a nil object reference, in which case it will not be notified if it is disconnected by the proxy push consumer
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Establishing Pull Model Connections
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A supplier that wants to register as a pull supplier first obtains a ProxyPullConsumer object reference by invoking obtain_pull_consumer on a SupplierAdmin object Similarly, a consumer that wants to pull events first obtains a ProxyPullSupplier by invoking ConsumerAdmin::obtain_pull_supplier These proxy interfaces are shown next
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module CosEventChannelAdmin { interface ProxyPullConsumer : CosEventComm::PullConsumer { void connect_pull_supplier( in CosEventComm::PullSupplier pull_supplier ) raises(AlreadyConnected, TypeError); }; interface ProxyPullSupplier : CosEventComm::PullSupplier { void connect_pull_consumer( in CosEventComm::PullConsumer pull_consumer ) raises(AlreadyConnected); }; //
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Like their push counterparts described in the preceding section, these interfaces inherit the basic pull model interfaces defined in the CosEventComm module (see Section 2052) ProxyPullConsumer and ProxyPullSupplier provide operations that
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allow pull suppliers and pull consumers, respectively, to establish connections to an event channel A supplier invoking connect_pull_supplier passes an object reference for its PullSupplier object By invoking pull on this object reference, the consumer can retrieve events from the supplier As described in Section 2052, the consumer can also invoke the disconnect_pull_supplier to disconnect the supplier from the channel A consumer calls connect_pull_consumer to make itself known to the target proxy pull supplier If it is interested in having the proxy pull supplier notify it when it is about to be disconnected, it can pass a non-nil PullConsumer object reference as an argument Otherwise, it must pass a nil object reference, in which case it will not be notified if it is disconnected by the proxy pull supplier
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