Download ZeroMQ: Messaging for Many Applications by Pieter Hintjens PDF
By Pieter Hintjens
Dive into ØMQ (aka ZeroMQ), the shrewdpermanent socket library that provides you speedy, effortless, message-based concurrency on your purposes. With this quick-paced advisor, you’ll study hands-on tips to use this scalable, light-weight, and hugely versatile networking software for replacing messages between clusters, the cloud, and different multi-system environments.
ØMQ maintainer Pieter Hintjens takes you on a travel of real-world functions, utilizing prolonged examples in C that will help you paintings with ØMQ’s API, sockets, and styles. find out how to use particular ØMQ programming concepts, construct multithreaded purposes, and create your individual messaging architectures. You’ll observe how ØMQ works with numerous programming languages and such a lot working systems—with very little cost.
- research ØMQ’s major styles: request-reply, publish-subscribe, and pipeline
- paintings with ØMQ sockets and styles through construction a number of small applications
- discover complex makes use of of ØMQ’s request-reply trend via operating examples
- construct trustworthy request-reply styles that continue operating while code or fails
- expand ØMQ’s center pub-sub styles for functionality, reliability, country distribution, and monitoring
- examine concepts for development a dispensed structure with ØMQ
- observe what’s required to construct a general-purpose framework for disbursed purposes
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Additional info for ZeroMQ: Messaging for Many Applications
Example text
In Android, a button click causes onClick() to be invoked in the OnClickListener instance configured for the button. The listener is provided the view that triggered the click (in this case, the button). toString()); } When we open the activity (onCreate()) or when the button is clicked (onClick()), we update the button’s label to be the current time via setText(), which functions much the same in Android as JButton does in Swing. Building and Running the Activity To build the activity, either use your IDE’s built-in Android packaging tool, or run ant in the base directory of your project.
Uses-library elements to hook in optional Android components, such as mapping services • Possibly a uses-sdk element to indicate what version of the Android SDK the application was built for. • An application element defining the guts of the application that the manifest describes. In the following example the manifest has uses-permission elements to indicate some device capabilities the application will need—in this case, permissions to allow the application to determine its current location.
Add rush delivery to my order”). In Android, there is a CheckBox widget to meet this need. It has TextView as an ancestor, so you can use TextView properties like android:textColor to format the widget. fm Page 32 Thursday, April 9, 2009 5:35 PM 32 CHAPTER 6 ■ EMPLOYING BASIC WIDGETS Also, you can register a listener object (in this case, an instance of OnCheckedChangeListener) to be notified when the state of the checkbox changes. setOnCheckedChangeListener(this)). The callback for the listener is onCheckedChanged(), which receives the checkbox whose state has changed and what the new state is.