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thislisten = null; thisdoLoop = false; thiscallDelay = 500; thispreferredTypes = "text/xml"; thisindex = thisinstanceCountcounter; thisinstances[ thisindex] = this; thisinstanceCountcounter ++; } ClientCommunicatorprototypestart = ClientCommunicator_start; ClientCommunicatorprototypeend = ClientCommunicator_end; ClientCommunicatorprototypesend = ClientCommunicator_send; ClientCommunicatorprototypeinstances = new Array(); ClientCommunicatorprototypeinstanceCount = new CounterHack(); The function ClientCommunicator is defined to be a constructor because the script of the HTML page in Figure 8-6 instantiates the type ClientCommunicator When ClientCommunicator is instantiated, many properties are defined and explained as follows The property server2client is an instance of Asynchronous that encapsulates XMLHttpRequest The property server2client is responsible for implementing the reading stream The property baseURL has already been discussed The properties username and password are used to identify the user, which in the case of the global status resource is not important.

The identifier could be the metadata, some random number, or some arbitrary link The returned information should provide enough data for the client to algorithmically create a complete link to the data and metadata If the POST does not provide any order information, then the assumption is that the client knows how to compose the metadata and link from the submitted data The downside to this strategy is that if the server-side metadata changes, the client-side code will need to be updated /pyservices/trader/historical/tickers/DELL This URL represents the root URL of a result Only the HTTP verbs GET and DELETE are supported The verb POST may be supported if you wish to recalculate the result of a request The concern with performing a recalculation is that in a multiuser situation, other users will see the new data and not be aware that some parts of the data have changed.

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Group Listen Loop Message Assignment Parallel Actions Port Receive Role Link Scope Send Start Orchestration Suspend Terminate Throw Exception Transform

Of course, just because the authorization information is not relevant for this specific example, it does not mean that authorization to the global status resource is not needed The property listen has already been discussed The EBVN property doLoop is a flag that indicates whether the periodic reading stream checks should be continued The property preferredTypes indicates the preferred MIME types that result in the preferred representation to receive as per the Permutations pattern The properties callDelay, index, instances, and instanceCount are all related and warrant a more detailed explanation to the problem they solve The problem relates to how a repeating loop is implemented in JavaScript In the Architecture section, you saw that to implement the reading stream, the client polls the data meaning a repeating loop is created Using a JavaScript-defined loop cannot solve the repetitious nature of a poll.

Generally speaking, it is better to consider a result as immutable The GET verb is supported to allow retrieval of the results The DELETE verb is supported to prune a result from the list A pruning is necessary so that the cache does not become cluttered with old results that have no meaning In the case of the ticker application, DELETE would not be.

Groups operations together in the orchestration designer for convenience Allows an orchestration to wait for a message to be received Allows an orchestration to loop until a set of conditions is met Allows an orchestration to assign values to promoted schema fields Allows an orchestration to execute multiple actions in parallel Allows an orchestration to connect to external systems for sending and receiving messages Allows an orchestration to receive a new message instance from a port Allows an orchestration to define a collection of ports that interact with the same system Allows an orchestration to specify a boundary that groups operations into a single transaction Allows an orchestration to send a message instance using a port Allows an orchestration to call another orchestration asynchronously Allows an orchestration to suspend operation while waiting for an error condition to be cleared Allows an orchestration to immediately stop when an error occurs Allows an orchestration to raise an error during processing Allows an orchestration to map an existing message instance into a new message instance

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