Supervisor Abstraction

This module implements a Supervisor class.

An example of supervisor declaration:

<entry>
    type = supervisor
    name = svisor1
    window = 12
    adjustments = 3
    strategy = one_for_one
    expected = none
    <children>
        .... other supervisors or services
    </children>
</entry>

Parameters

name

unique name of the supervisor.

window

window of supervision cycles which should be considered when defining if a supervisor is in a failing state.

adjustments

maximum number of cycles on which a child adjustment was needed in the given window of supervision cycle in order to consider it a failure.

strategy

• one_for_one: if a child process terminates, only that process is restarted.
• one_for_all: if a child process terminates, all other child processes are terminated and then all child processes, including the terminated one, are restarted.
• rest_for_one: If a child process terminates, the rest of the child processes i.e. the child processes after the terminated process in start order are terminated. Then the terminated child process and the rest of the child processes are restarted.

expected

none|running|stopped

children

children structure.

Required Parameters

- children section is required or supervisor is not useful

Default Parameters

- name = supervisor
- expected = none
- window = 12
- adjustments = 3
- strategy = one_for_one

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