20.4. 将消费者应用程序订阅到 PTP 事件
在 PTP 事件消费者应用程序可以轮询事件前，您需要将应用程序订阅到事件制作者。
20.4.1. 订阅 PTP 锁定状态事件
要为 PTP lock-state 事件创建一个订阅，使用以下 payload 向云事件 API（位于 http://localhost:8081/api/ocloudNotifications/v1/subscriptions）发送一个 POST 操作：
{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}响应示例
{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}
20.4.2. 订阅 PTP os-clock-sync-state 事件
要为 PTP os-clock-sync-state 事件创建一个订阅，使用以下 payload 向云事件 API（位于 http://localhost:8081/api/ocloudNotifications/v1/subscriptions）发送一个 POST 操作：
{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}响应示例
{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}
20.4.3. 订阅 PTP ptp-clock-class-change 事件
要为 PTP ptp-clock-class-change 事件创建一个订阅，使用以下 payload 向云事件 API（位于 http://localhost:8081/api/ocloudNotifications/v1/subscriptions）发送一个 POST 操作：
{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}响应示例
{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}