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Basic lifecycle patterns
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typically use a factory remote object to request the creation of new instances.
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Process A Machine Boundary Server Process 2b) create (params...) Remote Object 5b) create
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2a) newInstance(params...) Client 3) invoke 4) invoke 5) newInstance() Client 6) invoke
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Remote Factory 1) create
Process B
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Remote Object
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A factory remote object is created by the server application and made available to clients using LOOKUP. Clients use this factory to create and configure CLIENT-DEPENDENT INSTANCES. The client then invokes operations on its instance, and destroys the instance when it no longer needs it.
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E E E The most obvious difference between CLIENT-DEPENDENT INSTANCES and using STATIC INSTANCES and PER-REQUEST INSTANCES is that an additional component is introduced, the factory. This is necessary to allow clients to request a CLIENT-DEPENDENT INSTANCE that is specific to the client. In the case of a STATIC INSTANCE or a PERREQUEST INSTANCE, creation and activation of the remote object is handled by the SERVER APPLICATION and/or the distributed object middleware. The factory itself is typically a STATIC INSTANCE. When invoked by a client, it creates the requested CLIENT-DEPENDENT INSTANCE and returns the ABSOLUTE OBJECT REFERENCE of the newly-created instance to the client. As explained above, CLIENT-DEPENDENT INSTANCES typically are considered to be accessed by a single client only. As a consequence, no concurrency issues need be taken care of in the servant, with regard to client requests and its own state. If CLIENT-DEPENDENT INSTANCES can be accessed concurrently (for example, because a client can open multiple browser windows that are not coordinated), some kind of synchronization has to be implemented on the server side.
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Lifecycle Management Patterns In addition, access to global shared resources from within CLIENTDEPENDENT INSTANCES still needs to be serialized. To ensure that only one client accesses a CLIENT-DEPENDENT INSTANCE, the factory will only provide operations to create new instances. It is not possible to ask the factory to return some previously-created instance. The client therefore has to store the reference to the instance, and it is the client s own responsibility whether to pass the reference to other clients. Lifecycle management of CLIENT-DEPENDENT INSTANCES is easy if clients behave well. The clients are required to signal when to destroy the remote object, permitting the server application to remove the servant from memory. However, if a client forgets to invoke destroy, or if a client crashes, the server application may end up with orphan CLIENT-DEPENDENT INSTANCES. To avoid this, LEASING [KJ04] is used. This allows the removal of orphan CLIENT-DEPENDENT INSTANCES when the lease period expires. There are potential problems with the lifecycle model of CLIENT-DEPENDENT INSTANCES, though. The more clients a server application has, the more CLIENT-DEPENDENT INSTANCES might be created. Thus the server
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application is no longer in control of its own resources. This can be a serious issue for large, publicly-available systems in which you cannot control the number and behavior of the clients. To overcome this problem, the LIFECYCLE MANAGER can use PASSIVATION. PASSIVATION temporarily evicts a servant from memory, persist its state and creates a new servant with the previously-saved state upon the next client request.
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General resource management patterns
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General resource management patterns
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After introducing the three basic lifecycle management patterns for remote objects, we will now describe three resource management patterns originally described in [KJ04] LAZY ACQUISITION, POOLING, and LEASING as well as a state management pattern originally described in [VSW02], PASSIVATION. We provide specializations of these patterns in the context of distributed object middleware. After presenting the patterns, we will combine them with the basic lifecycle management patterns to show typical implementation strategies for lifecycle management of remote objects. LAZY ACQUISITION defers the creation of a servant for a remote object to the latest possible time the actual invocation of an operation on the remote object. POOLING describes how instantiation and destruction of servants of remote objects can be avoided by recycling servants that are no longer needed. Besides servants, there are many other resources that can be pooled in distributed object middleware, such as threads and connections see the pattern descriptions of CLIENT REQUEST HANDLER and SERVER REQUEST HANDLER, for example. Note that we refer to the original Pooling pattern in [KJ04] in these cases. LEASING explains how the resources of remote objects servants that are no longer needed can be reclaimed reliably. LEASING associates time-based leases with a servant, which clients have to extend to use the remote objects. Finally, PASSIVATION temporarily evicts servants from memory if the remote object is, for example, not accessed by clients for a specific period of time. The implementation of the lifecycle management patterns in distributed object middleware relies on the LIFECYCLE MANAGER as the key participant. The LIFECYCLE MANAGER is responsible for actually acquiring, pooling, leasing, and passivating the remote objects.
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