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Code Block
    protected HashMap<String, PowerState> sync() {
    	return getVmStates();
    }

The schema to add VM power state support is shown below.

Code Block
ALTER TABLE `cloud`.`vm_instance` ADD COLUMN `power_state` VARCHAR(64) DEFAULT 'PowerUnknown';
ALTER TABLE `cloud`.`vm_instance` ADD COLUMN `power_state_update_time` DATETIME;
ALTER TABLE `cloud`.`vm_instance` ADD COLUMN `power_state_update_count` INT DEFAULT 0;
ALTER TABLE `cloud`.`vm_instance` ADD COLUMN `power_host` bigint unsigned;
ALTER TABLE `cloud`.`vm_instance` ADD CONSTRAINT `fk_vm_instance__power_host` FOREIGN KEY (`power_host`) REFERENCES `cloud`.`host`(`id`);

There is one thing that is worth to note, since majority of time VM will stay in a particular stationary state for a long time, to reduce the number of DB writes, we will only update consecutive same-state update for a limit number of times. power_state_update_count is designed for this purpose.

2) Serialize VM operations

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