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TIBCO GridServer® 7.1.0

# Implementing Engine Hooks as a Grid Library

To implement an Engine Hook as a Grid Library you must create a type of Grid Library called a Super Grid Library. If you are unfamiliar with implementing a Grid Library, review Creating Services.

Super Grid Libraries are very similar to regular Grid Libraries. You still need to use a ZIP archive to contain the code and XML documents just like a regular Grid Library. In the `grid-library.xml`, you must add an attribute to the `<grid-library>` element called `super` which is set to `true`. Additionally, for the code to be used as an Engine Hook, you must specify a folder where the XML descriptor for the hook is contained. Below is an example of a `grid-library.xml` file that has been set up for an Engine Hook:

    <?xml version="1.0" encoding="UTF-8"?>
    <grid-library super="true">
        <grid-library-name>AddPropHook</grid-library-name>
        <grid-library-version>1.0</grid-library-version>
        <jar-path>
            <pathelement>jars</pathelement>
        </jar-path>
        <hooks-path>
            <pathelement>hook</pathelement>
        </hooks-path>
    </grid-library>

Populating the Super Grid Library is also very similar to a regular Grid Library. The folder structure includes the folder you specified in the `grid-library.xml` for the hook's XML descriptor and the `grid-library.xml` is placed at the top level of the folder structure within the Grid Library. For example, the following is the top level folder structure for an example Engine Hook:

        jars/
        AddPropHook.xml
        grid-library.xml

Once the Super Grid Library has been constructed, upload it to the Manager in exactly the same way as a standard Grid Library. After it is deployed, the Engines discover it is a Super Grid Library and immediately execute the `initialized()` method.

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