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A JavaScript loop takes control of the user interface and would lock the client from accepting further input or processing data Additionally, because asynchronous requests are made, the loop would result in an infinite number of requests to be issued The real problem here is that JavaScript does not implement true multithreading Had JavaScript implemented true multithreading, creating a never-ending JavaScript loop would not be a problem Even though JavaScript does not have true multithreading capabilities, it is possible to make it appear that it does An example of pseudo-multithreading was illustrated in 2 and required the use of a timer The solution to the problem of a locked browser when using loops is to create the impression of a loop by using a timer that goes off right away and calls a function.

appropriate because ticker history is a time series, and you can turn back the clock Pruning a time series is only appropriate when you have some data that is considered old and not appropriate for the context /pyservices/trader/historical/tickers/DELL/2006 This URL represents a specific part of a result and, if appropriate, should always be supported Supporting child URLs in a result allows the client code to fine-tune the result /pyservices/trader/historical/tickers/DELL filter=now This URL represents another way of fine-tuning the results For example, if a result generates too much data, using the filter with a value of now could fine-tune the result to the last 15 Fine-tuning does run the risk of missing results For example, say you are waiting for all of the results from a calculation, and therefore periodically call to retrieve the last 15 results.

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While the message schemas define the structure of XML messages and the orchestration defines the process, we still need to define a variable capable of referencing a message instance as it moves through the orchestration. These message variables allow us to interact with the fields that were promoted earlier in the schemas. You can create the message variables using the Orchestration Explorer, which is a window available in Visual Studio .NET by selecting View Other Windows Orchestration View from the menu. The Orchestration View contains a summary view of key elements in the orchestration including message variables. By right-clicking the Messages folder and selecting New Message, you can create message variables. The message variables are then associated with a message schema through the Message Type property. Figure 7-9 shows the Orchestration View window with some message variables defined.

The sequence of events that makes a timer look like a loop is defined as follows: 1 When the function is executed, an asynchronous XMLHttpRequest request is made, resulting in a calling of the reading stream 2 The function exits immediately as an asynchronous request is made, and no timer is called The web browser can continue accepting input and processing data..

What if the check period is an hour, and during one hour, 30 results are generated Using a filter to retrieve the last 15 means you will have missed 15 results You should not use a task-based approach when retrieving the last 15 deletes1 to maintain stability and the ability to reread results that might be lost if a browser stopped downloading the data You want a way to execute a backfill where the only reliable cache or storage mechanism is the server The best way to fine-tune the returned data is to use a cursor on the result set For example, if there are 15 results to a calculation, in addition to the mentioned URLs each result should be referenced using a unique URL identifying the result number Think of the result number as being part of a time series.

Ports are used in all BTS orchestrations because they connect the orchestration to other systems and processes. Ports are defined by dragging the port shape from the toolbox and dropping it onto the Port Surface portion of the orchestration designer. The port shape may be dropped onto any part of either the left or right Port Surface. These areas exist simply to organize the shapes and have no impact on their functionality. When you drop a port shape onto the Port Surface, the Port Configuration Wizard starts automatically. When configuring the port, you must associate it with a port type. Ports types

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