With the Queue Service, the Microsoft Azure platform offers a messaging service through which communication partners can communicate with one another asynchronously by exchanging messages. Access is made over http/https. APIs are available for the main programming languages and technologies such as .NET, Java, and PHP for convenient access to queues and messages. The use of the Queue Service is not limited to use within an Azurebased application. Communication partners can also be outside the cloud.
The most common usage scenario for the Queue Service is the exchange of messages between individual components of a cloud service. A frontend component (e.g., a Web role) accepts work orders from the user and places these as messages into a queue from which they are then read and processed by one or more backend components (e.g., worker role instances). Such an application can be scaled easily (e.g., based on the fill level of the queue): if the queue is often only slightly full or is empty, it may be possible to reduce the number of backend components. If the queue is always heavily filled, it may be possible to process messages more quickly by adding further backend components.
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