tServerAlive
Validates the status of the connection to a specified host.
tServerAlive checkes whether the
connection to a specified host is up or down, which is indicated by the boolean value returned
by the global variable SERVER_ALIVE_RESULT.
tServerAlive Standard properties
These properties are used to configure tServerAlive running in the Standard Job framework.
The Standard
tServerAlive component belongs to the Misc family.
The component in this framework is available in all Talend
products.
Basic
settings
|
Protocol |
Select either Ping or Telnet from the drop-down list of |
|
Host |
IP address or host name of the remote server to be checked. |
|
Timeout Interval (in seconds) |
Enter the timeout interval in seconds. If the target host is reached within this time, the |
|
Port |
Listening port number of the Telnet server. Available when Telnet is selected |
Advanced settings
|
tStatCatcher Statistics |
Select this check box to gather the Job processing metadata at a |
Global Variables
|
Global Variables |
SERVER_ALIVE_RESULT: the status of the connection to a
ERROR_MESSAGE: the error message generated by the A Flow variable functions during the execution of a component while an After variable To fill up a field or expression with a variable, press Ctrl + For further information about variables, see |
Usage
|
Usage rule |
This component is generally used as a one-component subJob. |
|
Limitation |
Validating the status of the connection to a remote host
In this scenario, tServerAlive is used to ping a
remote host and the value of its global variable SERVER_ALIVE_RESULT is extracted to show the connection status.
Dropping and linking components
- Drop the following components from the Palette onto the design workspace: tServerAlive, tFixedFlowInput, and tLogRow.
-
Connect tServerAlive to tFixedFlowInput using a Trigger > On Subjob Ok
connection. -
Connect tFixedFlowInput to tLogRow using a Row >
Main connection.
Configuring the components
-
Double-click tServerAlive to open its
Basic settings view.
-
In the Protocol drop-down list, select
Ping. -
In the Host field, enter the IP address
of the remote server to ping. -
In the Timeout Interval field, enter the
timeout interval in seconds. -
Double-click tFixedFlowInput to open its
Basic settings view.
-
Click the […] button next to Edit schema to open the schema editor.
-
Click the [+] button to add one column,
namely status, of the boolean
type.Click OK to validate the schema and close
the editor.In the dialog box that appears, click Yes
to propagate the changes to the subsequent component. -
In the Values table, press the Ctrl + Space keys in the Value field to select tServerAlive_1_SERVER_ALIVE_RESULT from the variable
list.
-
Double-click tLogRow to open its
Basic settings view.
-
Select Table (print values in cells of a
table) for a better display of the results.
Saving and executing the Job
- Press Ctrl+S to save your Job.
-
Press F6 to execute the Job.
As shown above, the remote server is pingable.