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Advanced Features Related to Solution Import from Servoy Admin Page
During solution import from the Servoy Admin Page, modules with certain name patterns are handled in a special way. Modules whose names start with "before_import" are handled as pre-import hooks. Their onOpen
event handlers are executed before the solution is actually imported. Similarly, modules whose names start with "after_import" are handled as post-import hooks. Their onOpen
event handles are executed after the solution is actually imported.
If you have several modules that start with "before_import" or "after_import", they will be all handled in this way, but no handling order is guaranteed. It is recommended that you have at most one pre-import and at most one post-import hook in your exported solutions.
While the onOpen
event handlers of pre-import and post-import hooks are being executed, any output printed with application.output
will be redirected to the import log, which you can see in the Servoy Admin Page.
A simple example
Suppose you have a solution called "import_sample_01", with two modules called "before_import_01" and "after_import_01". The "before_import_01" module has the following onOpen
event handler:
...
function onBeforeImportSolutionOpen()
{
application.output("Method executed before solution import.");
}
The "after_import_01" module has the following onOpen
event handler:
...
function onAfterImportSolutionOpen()
{
application.output("Method executed after solution import.");
}
If you export this solution together with its two modules, and then you import it throught the Servoy Admin Page, in the import log you should see the lines
No Format |
---|
[info] Executing pre-import hook module 'before_import_01'.
[info] Method executed before solution import.
|
before any message related to the actual solution import, and also you should see the lines
No Format |
---|
[info] Executing post-import hook module 'after_import_01'.
[info] Method executed after solution import.
|
after all messages related to the actual solution import.
What else can you do? The maintenance
plugin.
The pre-import and post-import hooks were introduced for allowing you to automatically perform administrative tasks on the server while importing solutions:
- Send messages to connected clients, or even kill connected clients.
- Put the server into maintenance mode for the duration of the solution import.
- Perform operations on databases.
...
The maintenance
plugin
The maintenance
plugin is a new plugin available since the 4.2 version of Servoy. It allows you to automatically perform administrative tasks, like:
- Sending notifications to connected clients
- Killing connected clients
- Retriving information about connected clients
- Putting the server into maintenance mode, and bringing it out of maintenance mode
- Creating and deleting tables in databases.
- Adding and removing columns to/from tables in databases.
Function | getConnectedClients |
---|---|
Description | Returns an array of IClientInformation elements describing the clients connected to the server. |
Syntax
Parameters
Example |
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