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Invocations of remote objects must execute asynchronously, and the client depends on the results for further computations. E E E There are situations in which an application needs to invoke an operation asynchronously, but still needs to know the results of the invocation. The client does not necessarily need the results immediately to continue its execution, and can decide for itself when to use the returned results. Consider a client that needs to prepare a complex XML document to be stored in a relational database accessed through a remote object. The document should have an unique ID: this is generated by the database system. Typically a client would request an ID from the database, wait for the result, create the rest of the XML document, then forward the complete document to the remote object for storage in the database. A more efficient implementation would be to request the ID from the database first. Without waiting for the ID, the client can prepare the XML document, receive the result of the ID query, put it into the document, then forward the whole document to the remote object for storage. In general, a client application should be able to make use of even short periods of latency, instead of blocking until a result arrives. Therefore: Provide POLL OBJECTS that receive the results of remote invocations on behalf of the client. The client subsequently uses the POLL OBJECT to query the result. It can either just query ( poll ) whether the result is available, or it can block on the POLL OBJECT until the result becomes available. As long as the result remains unavailable from the POLL OBJECT, the client can continue with other tasks asynchronously.
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Process A 1) invoke Client 3) resultAvailable() = false 5) resultAvailable() = true 6) getResult()
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A client invokes a remote operation on the REQUESTOR, which in turn creates a POLL OBJECT to be returned to the client immediately. As long as the remote invocation has not returned, the result available operation of the POLL OBJECT returns false. When the result becomes available, it is memorized in the POLL OBJECT. When it is next polled it returns true, and the client can fetch the result by calling the get result operation.
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E E E The POLL OBJECT has to provide at least two operations: one to check whether the result is available, the other to actually return the result to the calling client. Besides this client interface, an operation for storing the result received from the server is needed. Most POLL OBJECT implementations also provide a blocking operation that allows clients to wait for the availability of the result if they choose to do so. The core idea of this pattern follows the Futures concept described in [Lea99], but POLL OBJECT extends it to distributed settings and allows the availability of the result to be queried in a non-blocking fashion whereas with Futures this query would block. typically depend on the interface of the remote object. That is, the client requires a POLL OBJECT that offers the out parameters and return values of the remote object s operations. There are three options in the design of POLL OBJECTS:
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A separate POLL OBJECT type is provided for each remote operation. That is, the number of POLL OBJECT types for one remote object equals the number of remote operations of the remote object.
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Invocation Asynchrony Patterns One POLL OBJECT type is provided per remote object, and the operation to get the result must be provided for each of the remote object s operations, offering the out parameters and return values of that remote operation. A generic POLL OBJECT type is provided offering a get result operation with a generic type, such as C s void* or Java s Object. It is the client s burden to provide the correct type conversions. In this variant static type checks are not possible. Use POLL OBJECTS when the time until the result is received is expected to be relatively short, but long enough to allow the client to use the time for other computations. For longer wait periods, especially if the period cannot be estimated, use a RESULT CALLBACK. This is because it is hard to manage a potentially large number of POLL OBJECTS over a long period. A number of small programming tasks would be required between the polls, and polling would have to be triggered constantly. This constant triggering can be avoid by using RESULT CALLBACKS.