来自 Web 服务的推送通知 [英] PUSH Notifications from a Web service

问题描述

我有一个网络服务，可以定期在数据库中存储移动用户的位置.我现在想尝试将 push 通知从网络服务发送到 Android 应用.我知道这可以使用 Android 版 GCM 来实现.

I have a web service that stores locations of a mobile user in the DB periodically. I now want to try sending push notifications from the web service to the Android app. I understand that this can be achieved using GCM for Android.

但是，我不确定如何运行一个持续监控数据库的进程.有人可以建议我如何实现这一目标吗?

However, I am not sure how I can run a process that continuously monitors the DB for a condition. Can somebody suggest how I can achieve this?

在Web服务的constructor中创建一个thread来完成监控任务是否有助于保持持续监控?

Will creating a thread to do the monitoring task in the constructor of the web service help to maintain a constant monitor?

PS:目前我正在启动一个线程，当应用程序调用 store 方法然后将 POST 请求发送到 GCM 服务器以推送通知时，它将检查数据库中我需要的条件条件满足.

P.S: At the moment I am just starting a thread which will check the DB for the condition I need when the app calls the store method and then sends POST request to GCM server to push notifications if the condition is satisfied.

推荐答案

完成此任务的步骤 -

1. 创建一个 servlet 并在部署描述符中注册它
2. 覆盖servlet
的init方法
3. 创建一个线程并在init 方法中启动它.使用while循环无限执行来做监控任务
4. 最重要 - 通过将以下行添加到部署描述符中，在服务器启动期间强制 servlet 初始化.此链接中的信息 - http://jersey.576304.n2.nabble.com/Initialization-at-startup-as-opposed-to-first-request-td5164440.html

1. Create a servlet and register it in the deployment descriptor
2. Override the init method of the servlet
3. Create a thread and start it in the init method. Use a while loop to execute infinitely to do the monitoring task
4. Most important - force the servlet initialization during server startup by adding the following line to the deployment descriptor. Info at this link - http://jersey.576304.n2.nabble.com/Initialization-at-startup-as-opposed-to-first-request-td5164440.html

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