Chromium Blog
News and developments from the open source browser project
Building efficient apps and extensions with push messaging
Thursday, May 9, 2013
Event pages keep apps and extensions efficient by allowing them to respond to a variety of events such as timers or navigation to a particular site, without having to remain running persistently. But what if you need to respond to something that occurs outside of Chrome, such as a news alert, a message sent to a user or a stock hitting a price threshold? Until now, you had to do this by repeatedly polling a server. This process consumed bandwidth and reduced the battery life of your users’ machines. For a more efficient solution, starting today you can use
Google Cloud Messaging for Chrome
(GCM) - across all channels of Chrome.
GCM will be familiar to developers who have used
Google Cloud Messaging for Android
. To send a message, all you need to do is:
Request a token (channel ID) via
chrome.pushMessaging.getChannelId()
.
Pass the returned token to your server.
Whenever you need to send a message to your app or extension, post the message along with the token to the GCM server-side API.
Your message is then delivered in near real time to Chrome. This makes your event page wake up (if it’s not already running), and the message is delivered to your
chrome.pushMessaging.onMessage
listener.
To use GCM, your users must be signed into Chrome, as the service relies on an efficient push channel that’s only established for signed-in users. Messages are automatically delivered to all the devices where the user has signed in and installed your app/extension.
To add GCM to your app/extension, take a look at the
overview
of the service or start with some of the
sample apps
—and start pushing!
Posted by Mark Scott, Product Manager
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