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Operation Engine

https://blueprints.launchpad.net/karbor/+spec/operation-engine-design

Operation Engine is one of components in Karbor, which is responsible for triggering the operations to execute when the time is up or event happens.

Problem description

1. Define the operations and triggers (time or event)

2. Bind the operation with trigger and activate the trigger

3. Define the executor which will run the operations

4. Ensure the high availability of Operation Engine Service

Use Cases

1. CRUD operations and triggers

Proposed Change

Data model impact

There are 5 relevant tables in the DB.

1. triggers

2. services

3. scheduled_operations These three tables are defined at https://blueprints.launchpad.net/openstack/?searchtext=api-service-design. Please see the bp to get the details.

4. scheduled_operation_states

Field	Type	Null	Key	Default	Extra
created_at	datetime	YES		NULL
updated_at	datetime	YES		NULL
deleted_at	datetime	YES		NULL
id	init(11)	NO	PRI	NULL	auto_increment
operation_id	varchar(36)	NO		NULL
service_id	int(11)	NO		NULL
state	varchar(32)	NO		NULL	values: init registered triggered running deleted
deleted	tinyint(1)	NO		NULL

FOREIGN KEY(operation_id) REFERENCES scheduled_operations(id) FOREIGN KEY(service_id) REFERENCES Services(id)

5. scheduled_operation_logs

Field	Type	Null	Key	Default	Extra
created_at	datetime	YES		NULL
updated_at	datetime	YES		NULL
deleted_at	datetime	YES		NULL
id	int(11)	NO	PRI	NULL	auto_increment
operation_id	varchar(36)	NO		NULL
expect_start_time	datetime	YES		NULL
triggered_time	datetime	YES		NULL
actual_start_time	datetime	YES		NULL
end_time	datetime	YES		NULL
state	varchar(32)	NO		NULL	values: in_progress success failed dropped_out_of_window
extend_info	Text	YES		NULL	execution info
deleted	tinyint(1)	NO		NULL

FOREIGN KEY(operation_id) REFERENCES scheduled_operations(id)

instance:

created_at	updated_at	deleted_at	id	operation_id	expect_start_time	triggered_time	actual_start_time	end_time	status	extend_info	deleted
2016-01-01 01:00:02	2016-01-01 01:00:07	NULL	0	0354ca9ddcd046b693340d78759fd274	2016-01-01 01:00:00	2016-01-01 01:00:02	2016-01-01 01:00:05	2016-01-01 01:00:07	success	NULL	0

Class Diagram

Flow