feature/#416 documentation for core notification

docs/manuals/userman/sdm/events/code-example/create-and-start-core-event-consumer.py

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+from time import sleep
+
+from taipy.core.notification import CoreEventConsumerBase, Event, Notifier
+
+
+# Define a custom event consumer.
+class MyEventConsumer(CoreEventConsumerBase):
+    def process_event(self, event: Event):
+        # Custom event processing logic here
+        print(f"Received a {event.entity_type} {event.operation} event at : {event.creation_date}")
+
+
+if __name__ == "__main__":
+    import taipy as tp
+    from taipy import Config
+
+    # Create a scenario configuration.
+    some_datanode_cfg = Config.configure_data_node("data", default_data="Some content.")
+    print_task_cfg = Config.configure_task("print", print, some_datanode_cfg)
+    scenario_config = Config.configure_scenario("scenario", [print_task_cfg])
+
+    # Run the core service.
+    orchestrator = tp.Orchestrator().run()
+
+    # Register to the Notifier to retrieve a registration id and a registered queue.
+    registration_id, registered_queue = Notifier.register()
+
+    # Create a consumer and start it.
+    consumer = MyEventConsumer(registration_id, registered_queue)
+    consumer.start()
+
+    # The scenario creation and submission will trigger event emissions.
+    scenario = tp.create_scenario(scenario_config)
+    submission = tp.submit(scenario)
+
+    # The events are processed in parallel by the consumer.
+    # So we need to wait for the consumer to process the events.
+    sleep(1)
+
+    # Stop the consumer and unregister from the Notifier.
+    consumer.stop()
+    Notifier.unregister(registration_id)

docs/manuals/userman/sdm/events/code-example/external-api-call-notifier.py

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+import requests
+
+import taipy as tp
+import taipy.gui.builder as tgb
+from taipy import Config, Gui, Orchestrator
+from taipy.core import SubmissionStatus
+from taipy.core.job.status import Status
+from taipy.core.notification import CoreEventConsumerBase, EventEntityType, EventOperation, Notifier
+from taipy.gui import notify
+
+##### Configuration and Functions #####
+
+
+def fail_task(name: str):
+    raise Exception(f"This function is trigger by {name} and is supposed to fail, and it did!")
+
+
+name_data_node_cfg = Config.configure_data_node(id="input_name", default_data="Florian")
+message_data_node_cfg = Config.configure_data_node(id="message")
+build_msg_task_cfg = Config.configure_task("build_msg", fail_task, name_data_node_cfg, message_data_node_cfg)
+scenario_cfg = Config.configure_scenario("scenario", task_configs=[build_msg_task_cfg])
+
+value = "Default text"
+
+
+#### Notification function to be called ####
+
+
+def trigger_api_of_job_failure(job_id):
+    requests.get("http://127.0.0.1:5000/replace-this-with-your-api", params={"message": f"Job {job_id} failed."})
+
+
+class JobFailureCoreConsumer(CoreEventConsumerBase):
+    def __init__(self):
+        reg_id, queue = Notifier.register(
+            entity_type=EventEntityType.JOB, operation=EventOperation.UPDATE, attribute_name="status"
+        )  # Adapt the registration to the events you want to listen to
+        super().__init__(reg_id, queue)
+
+    def process_event(self, event):
+        if event.attribute_value == Status.FAILED:
+            trigger_api_of_job_failure(event.entity_id)
+
+
+#### Normal callbacks ####
+
+
+def create_and_submit_scenario(state):
+    scenario = tp.create_scenario(config=scenario_cfg)
+    tp.submit(scenario)
+
+
+#### Page ####
+
+with tgb.Page() as page:
+    tgb.text("{value}")
+    tgb.button("Create and submit a scenario!", on_action=create_and_submit_scenario)
+
+
+if __name__ == "__main__":
+    orchestrator = Orchestrator()
+    gui = Gui(page)
+    orchestrator.run()
+    JobFailureCoreConsumer().start()
+    gui.run()

docs/manuals/userman/sdm/events/code-example/register-specific-topic-to-notifier.py

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+from time import sleep
+
+from taipy.core.notification import CoreEventConsumerBase, Event, EventEntityType, EventOperation, Notifier
+
+
+def double(nb):
+    return nb * 2
+
+
+# Define a custom event consumer.
+class MyEventConsumer(CoreEventConsumerBase):
+    def process_event(self, event: Event):
+        # Custom event processing logic here'
+        print(f"Received event of type: {event.entity_type}; and of operation: {event.operation}.")
+
+
+if __name__ == "__main__":
+    import taipy as tp
+    from taipy import Config
+
+    print(f"(1) Number of jobs: {len(tp.get_jobs())}.")
+
+    # Create a scenario configuration with 2 sequential tasks.
+    input_data_node_cfg = Config.configure_data_node("my_input", default_data=21)
+    print_task_cfg = Config.configure_task("print_task", print, input_data_node_cfg)
+    scenario_config = Config.configure_scenario("my_scenario", [print_task_cfg])
+
+    # Run the core service.
+    tp.Orchestrator().run()
+
+    # Register to the Notifier to retrieve events related to all scenarios' creations.
+    registration_id, registered_queue = Notifier.register(EventEntityType.SCENARIO, operation=EventOperation.CREATION)
+
+    # Create a consumer and start it.
+    consumer = MyEventConsumer(registration_id, registered_queue)
+    consumer.start()
+
+    # Create a scenario and submit it.
+    scenario = tp.create_scenario(scenario_config)
+
+    sleep(1)
+
+    # Stop the consumer and unregister from the Notifier.
+    consumer.stop()
+    Notifier.unregister(registration_id)

docs/manuals/userman/sdm/events/code-example/user-changes-notifier.py

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+import taipy as tp
+import taipy.gui.builder as tgb
+from taipy import Config, Gui, Orchestrator
+from taipy.core import SubmissionStatus
+from taipy.core.notification import CoreEventConsumerBase, EventEntityType, EventOperation, Notifier
+from taipy.gui import notify
+
+##### Configuration and Functions #####
+
+
+def build_message(name: str):
+    return f"Hello {name}!"
+
+
+name_data_node_cfg = Config.configure_data_node(id="input_name", default_data="Florian")
+message_data_node_cfg = Config.configure_data_node(id="message")
+build_msg_task_cfg = Config.configure_task("build_msg", build_message, name_data_node_cfg, message_data_node_cfg)
+scenario_cfg = Config.configure_scenario("scenario", task_configs=[build_msg_task_cfg])
+
+value = "Default text"
+
+
+#### Notification function to be called ####
+
+
+def notify_users_of_creation(state):
+    state.value = "Scenario created and submitted"
+    notify(state, "s", "Scenario Created")
+
+
+def notify_users_of_update(state, new_value_of_dn):
+    print("Value of Data Node:", new_value_of_dn)
+    state.value = f"Data Node updated with value: {new_value_of_dn}"
+    notify(state, "i", "Data Node Updated")
+
+
+class SpecificCoreConsumer(CoreEventConsumerBase):
+    def __init__(self, gui):
+        self.gui = gui
+        reg_id, queue = Notifier.register()  # Adapt the registration to the events you want to listen to
+        super().__init__(reg_id, queue)
+
+    def process_event(self, event):
+        if event.operation == EventOperation.CREATION:
+            if event.entity_type == EventEntityType.SCENARIO:
+                self.gui.broadcast_callback(notify_users_of_creation)
+        elif event.operation == EventOperation.UPDATE:
+            if event.entity_type == EventEntityType.SUBMISSION:
+                print(event)
+                if event.attribute_value == SubmissionStatus.COMPLETED:
+                    scenario_id = event.metadata["origin_entity_id"]
+                    scenario = tp.get(scenario_id)
+                    new_value_of_dn = scenario.message.read()
+                    self.gui.broadcast_callback(notify_users_of_update, [new_value_of_dn])
+
+
+#### Normal callbacks ####
+
+
+def create_and_submit_scenario(state):
+    scenario = tp.create_scenario(config=scenario_cfg)
+    tp.submit(scenario)
+
+
+#### Page ####
+
+with tgb.Page() as page:
+    tgb.text("{value}")
+    tgb.button("Create and submit a scenario!", on_action=create_and_submit_scenario)
+
+
+if __name__ == "__main__":
+    orchestrator = Orchestrator()
+    gui = Gui(page)
+    orchestrator.run()
+    SpecificCoreConsumer(gui).start()
+    gui.run()

docs/manuals/userman/sdm/events/events-description.md

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+The `Event^` object in Taipy is a notification mechanism for any changes occurring within Taipy Core,
+particularly those related to the Scenario and Data Management. It is a crucial part of the system that allows
+tracking and responding to changes in the state of various entities managed by Taipy, such as data nodes, jobs,
+and scenarios.
+
+An `Event^` object is composed of several key attributes that describe what happened, the
+type of operation performed, the entity concerned and its type, and other contextual
+details.
+
+1. `entity_type`
+    - **Type**: `EventEntityType^` (Enum)
+    - **Description**: Specifies the type of entity that has undergone a change. This
+        attribute helps identify the nature of the object affected. The possible entity
+        types are:
+
+        - `CYCLE`
+        - `SCENARIO`
+        - `SEQUENCE`
+        - `TASK`
+        - `DATA_NODE`
+        - `JOB`
+        - `SUBMISSION`
+
+2. `operation`
+    - **Type**: `EventOperation^` (Enum)
+    - **Description**: Indicates the type of operation performed. The `operation` attribute
+        is essential for understanding the nature of the change. The possible operations are:
+
+        - `CREATION` - An entity has been created.
+        - `UPDATE` - An entity has been updated.
+        - `DELETION` - An entity has been deleted.
+        - `SUBMISSION` - An entity has been submitted for processing.
+
+3. `entity_id`
+    - **Type**: `str`
+    - **Description**: The unique identifier for the entity that has been changed. This
+        ID allows you to precisely identify which object in the system the event refers to.
+
+4. `attribute_name`
+    - **Type**: `str`
+    - **Description**: The name of the specific attribute that has been changed within
+        the entity. This attribute is only relevant for `UPDATE` operations, where
+        a specific field of an entity has been modified.
+
+5. `attribute_value`
+    - **Type**: `Any`
+    - **Description**: The new value of the changed attribute. Like `attribute_name`, this
+        only applies to `UPDATE` operations.
+
+6. `metadata`
+    - **Type**: `dict`
+    - **Description**: A dictionary containing additional metadata about the source of the
+        event. This can include context-specific information that provides more insight into
+        the event's origin or purpose.
+
+7. `creation_date`
+    - **Type**: `datetime`
+    - **Description**: The exact date and time the event was created.
+
+!!! example "Scenario creation event"
+    For example, when a scenario is created, an event is emitted with
+    the following attributes:
+        - `entity_type`: `EventEntityType.SCENARIO^`
+        - `operation`: `EventOperation.CREATION^`
+        - `entity_id`: the id of the scenario
+        - `creation_date`: the date and time of the event creation
+
+Events are particularly useful when you want to:
+    - Update the user interface (e.g., update a list of scenarios when a new one is created)
+    - Trigger an action (e.g., automatically submit a scenario when its input data is updated)
+    - Notify end-users (e.g., send a GUI notification to all users when a job fails)
+    - etc.
+
+For more examples, see the [examples](examples.md) page.

docs/manuals/userman/sdm/events/examples.md

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+Examples of using Taipy event notifications to capture and consume *events*.
+
+# Real-Time GUI Updates with Taipy Event Consumers
+
+This script defines a custom event consumer class `SpecificCoreConsumer`, which listens
+for all events published by Taipy Core and triggers GUI notification based on those events.
+It includes determining if the event is published from a `Scenario^` entity or `DataNode^` entity
+and if the action is `CREATION^` or `UPDATE^`.
+
+!!! example
+    ```python linenums="1"
+    {%
+    include-markdown "./code-example/user-changes-notifier.py"
+    comments=false
+     %}
+    ```
+
+    This snippet shows a how you can capture and process events to notify user whenever
+    a new scenario is created or the value of a data node is updated.
+    For more details, see the [registration](understanding-topics.md) page.
+
+# External API triggered with Taipy Event Consumers
+
+This script defines a custom event consumer class `JobFailureCoreConsumer`, which listens
+for all events published by Taipy Core, when a `JOB^` entity's `status` attribute is `UPDATE`,
+and triggers an external API call based on the `JOB^`'s `id`.
+
+!!! example
+    ```python linenums="1"
+    {%
+    include-markdown "./code-example/external-api-call-notifier.py"
+    comments=false
+     %}
+    ```
+
+    This snippet shows a how you can capture and process `JOB^` events when an `UPDATE` is made to the `status`
+    of the `JOB^` and request an external API.
+    For more details, see the [registration](understanding-topics.md) page.