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CHAPTER 8 PERSISTENT COMMUNICATIONS PATTERN
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too quickly will waste network and server resources.4 This is a sort of damned-if-you-do and damned-if-you-don t situation. The solution is to create two streams used by the client and server to communicate with one another. The first stream is used to receive messages, and the second stream is used to send messages. To receive messages, the client polls the server with a request for messages. If there are no messages, the server does not respond with an answer immediately. The server puts the poll request on hold for a specific amount of time or until a message is generated by the server. Putting the poll on hold puts the client on hold while waiting for a message. A traditional poll will query the server, get an answer, and then wait until the next poll. The waiting period until the next poll is dead time during which neither the client nor the server can communicate with each other. By converting the dead time into a wait created by the server, the client is waiting for the potential of a message being generated. Two streams are necessary because while the client is waiting for a response from the server, the client might want to send a message to the server. If one stream is waiting for a response, it is not possible to send content by using the waiting stream. The solution is to create another stream for sending content to the server or for writing purposes. From the perspective of the server, the other stream is a request that sends data. In terms of HTTP, the reading stream that is put on hold waiting for content is an HTTP GET, and the writing stream that sends content is an HTTP POST or PUT. In technical implementation terms, for the reading stream the HTTP server puts the socket and thread that are processing the request on hold. Putting the thread on hold is not a problem for HTTP servers. What is a problem is that thousands of threads could be waiting for messages that may or may not be E B V N generated. One solution is to get a big enough computer with enough RAM. Another solution is to specifically find an HTTP server that can deal with this problem elegantly.5 Another potential problem on the HTTP server is that the two streams might conflict. The reading stream executes on one thread, and the writing stream executes on another thread. Both threads might be accessing the same piece of data, and hence synchronization is required. From an architectural perspective, the two-stream communication mechanism appears similar to Figure 8-5. In Figure 8-5, the browser interacts with a type called ClientCommunicator. The purpose of ClientCommunicator is to create the two-stream communication mechanism and process messages that are sent and received from the server. In the implementation of ClientCommunicator, two separate instances of XMLHttpRequest are used. One instance of XMLHttpRequest represents the reading stream and calls the resource /resource/receive. The second instance of XMLHttpRequest represents the writing stream and calls the resource /resource/send. On the server side is something called ServerCommunicator, which is responsible for combining the two streams. The resources /resource/receive and /resource/send were used to illustrate the nature of the data direction; they do not refer to actual URLs. As mentioned earlier, writing involves using HTTP POST or PUT, and reading involves using HTTP GET. Because these two HTTP verbs are distinct from each other, the same URLs can be used for both streams.
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4. It is possible to use HTTP persistent connections, and doing so reduces network bandwidth and is a good thing in general. However, HTTP persistent connections do not solve the server-to-client communication problem. 5. http://jetty.mortbay.org/jetty/ is a URL to the Jetty HTTP server. For version 6.0, Jetty has solved the waiting thread and resource problem and is a recommended solution for Java programmers implementing the Persistent Communications pattern.
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