Resources & Remarks

• concept article linking to the respective tutorials

Modification History

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The AMQP Hooks allow for asynchronous reactions to events like object creation, update or deletion. There are different types of AMQP Hooks available, each of them specialized for selected function calls. The messages contain the properties of the object metadata which object metadata which is the target of the function call triggering the AMQP Hook. The action code is included in the message as well as the history code that is added to the audit trail. The AMQP Hook can be triggered by any endpoint that induced the characteristic history codes of the AMQP Hook.

Types of AMQP

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Hooks

Parameters

The AMQP configuration is located in the amqp key under the systemhooks top-level key. It is represented as a list of one or more System Hooks whose parameters are described in the table below:

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enable

predicate

type

url

user

password

queue

bulkSize

Example Configuration

The parameters of the AMQP Hook are specified in JSON format. In the configuration file  ich würde den hier auch noch mal nennen, multiple AMQP Hooks can be defined in a list called amqp. It must however be observed that only one messaging queue can be used. The messaging queue specified for the first defined AMQP Hook will apply to all following AMQP Hook definitions as well. Of course, the messaging system needs to support AMQP 1.0. Any changes to the AMQP Hook configuration require a restart of the API-gateway service.

The example code below configures an AMQP Hook triggered by a document import. This configuration has exactly one System Hook, which is an AMQP Hook of the type object.insert.document. If the evaluation of the predicate for a document on import results is true (in our example only for compound documents), the API-gateway service sends a message with the metadata of the document to the defined messaging system. In addition, the configuration specifies a bulkSize of 10, i.e. for a batch import of 100 documents matching the predicate, 10 messages with 10 metadata entries per message are written to the queue named lc.textextraction.

{
    "systemhooks": {
        "amqp": [
            {
                "enable": true,
                "predicate": "spel:(contentStreams != null && contentStreams.size() > 0 && contentStreams[0]['range'] != null && contentStreams[0]['range'].length() > 0) ? true : false",
                "type": "object.insert.document",
                "url": "127.0.0.1:5672",
                "user": "admin",
                "password": "admin_pwd",
                "queue": "lc.textextraction",
                "bulkSize": 10
            }
        ]
    }
}

Activating the AMQP Hook

In our example of asynchronous full-text indexing, the API-gateway service is responsible for evaluating the system hook. To apply the configuration, the API-gateway service must be restarted after saving the configuration file. Messages will then be send to the messaging system  haben wir hier was zur Installation for the import of compound documents.

Types of AMQP Hooks

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Configuring AMQP Hooks

As a type of system hooks, AMQP Hooks are configured in the \service-manager\config\system\systemHookConfiguration.json configuration file within the service manager in JSON format. Any changes to the system hook configuration will not apply until the affected services have been restarted.

>> systemHookConfiguration.json

Summary

In this article, we gave an introduction to AMQP Hooks, covered the configuration using the example of asynchronous full text indexing and provide a list of all AMQP Hooks available. Check out Webhooks which are the second type of System Hooks in yuuvis® Momentum.

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