Figure DA22 Clustering Multiple Devices With a Single Proxy in One Device in Java

Encoder Code 128B in Java Figure DA22 Clustering Multiple Devices With a Single Proxy in One Device
Figure DA22 Clustering Multiple Devices With a Single Proxy in One Device
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The savings for the device manufacturer in this case comes from the ability of multiple physical devices to share a device bay, which contains the intelligence, memory, and perhaps other components (such as the power supply) By sharing these resources among multiple devices, the extra cost and engineering needed to interact with a system of services and/or devices using Jini technology can be amortized over a large number of devices The cost of this approach to the device manufacturers is that the protocol between the device acting as the Jini technology enabled device bay and the devices that are placed in that bay must be defined in advance and cannot change over time Because there is no way of introducing dynamic behavior in the particular devices, the pairing of device and Jini technology enabled device bay must be controlled and known beforehand It should be noted that the Jini technology enabled device bay itself is a Jini technology enabled device, which can be thought of as providing services to those devices housed within it As such, it could be a revenue item in its own right Variations in the implementation could be provided to support various internal announcement protocols (device bay, jetsend, etc) or hardware buses (including network like buses such as firewire) DA24 Clustering Devices with a Shared Virtual Machine (Network Option) A variation on the device bay approach uses the network rather than a physical enclosure and backplane On this alternative, a proxy for the JVM used by the various service devices would exist on the network Service devices could be added to the network, discover the existence of such a proxy device, and register with that proxy Such a registration could include the code written in the Java programming language needed by a client of the device (either directly or as a URL to use to obtain the code) and code needed by the proxy to communicate with the service device When a service device registers with such a network proxy, the proxy device would register with the Jini lookup service on behalf of the service device, thus allowing the service device to become a part of the federation of Jini technology enabled services and/or devices Requests to the new service would go first to the proxy for that device, which could then forward the requests (after appropriate protocol translation) to the particular service device In addition, the proxy could handle the Jini technology specific tasks such as renewing leases for the service This alternative is shown in Figure DA23
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Figure DA23 Clustering Devices With a Jini Technology Enabled Proxy on the Network
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This alternative requires somewhat more hardware for the individual device, as it requires each service device using such a proxy to be able to be placed on the network and have its own power supply and network connection However, the devices would not need individual CPUs, memory, or persistent store; all of that would be provided by the networked proxy for the Jini technology enabled device Devices using this option would need to have a protocol parallel to the Jini discovery protocol between the individual service devices and the network proxy for those devices This could be a specialized code on the network, known in advance, that the devices can use to identify themselves to the network proxy This will have to be particular to the device and the proxy for that device However, once this protocol has been decided upon, no other intelligence needs to be built into the device All of the intelligence can be built into the network proxy, perhaps uploaded into the proxy by the service device (which could easily carry code written in the Java programming language, even though it cannot execute that code) The protocol the network proxy uses to talk to the devices for which it is a proxy also needs to be statically defined in advance and cannot be changed However, it can be any protocol the particular device needs In this approach, the individual devices will be more complex than they would be in the Jini technology enabled device bay approach However, the number of devices that can be served by a network available proxy is not limited by the physical constraints of the proxy device Nor is there any requirement that the devices and the proxy device be co located, which is a requirement on the physical clustering scheme This is also the approach that can be taken to build "gateways" between the Jini technology enabled devices and other network managed devices Such devices, which already speak a particular protocol, can be spliced into the system of Jini technology enabled services and/or devices by providing a network proxy that speaks the Jini technology protocols on behalf of such devices, and the existing specialized protocol to such devices This is the approach that can be used to add consumer electronic devices, factory controls, or home environment controls into the system of Jini technology enabled services and/or devices DA25 Jini Technology Enabled Software Services over the Internet Inter Operability Protocol A final method for connecting devices or services that are not purely based on Java technology software into a system of Jini technology enabled services and/or devices, centers on using the Object Management Group (OMG)'s Internet Inter Operability Protocol (IIOP) This protocol defines a standard for data transmission that will be supported by a subset of RMI DA2 Basic Device Architecture Examples 319
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition This approach relies on the ability of a device to read an IIOP stream directly, either because the device includes an implementation of a Common Object Request Broker Architecture (CORBA) Object Request Broker (ORB) or because the device knows what IIOP streams to expect and can interpret streams of these known forms directly This approach requires the Jini lookup service to supply implementations of its interfaces over both the native RMI protocol and the IIOP protocol This is supported by RMI over IIOP as long as the interfaces conform to any subsetting requirements established by the OMG At the present time it appears that the Jini lookup service interfaces are in conformance with the RMI over IIOP subset Devices that contain a CORBA ORB could directly interact with the Jini lookup service using the IIOP protocol The fact that the Jini lookup service gener ated this protocol via RMI would be transparent to the service itself, and the fact that the service was using a method other than RMI to reply to the Jini lookup service (to renew leases, for example) would be transparent to the Jini lookup service Current differences between the RMI programming model and the CORBA programming model would need to be dealt with by the device itself; for example, the device would not be able to download the implementation of the stub for the Jini lookup service, and would need an implementation of the Lease class used by the Jini lookup service Devices that do not include a CORBA ORB could directly interpret the IIOP stream and attempt to interact with the Jini lookup service This approach requires very little software support on the side of the device (since the bitstream from the wire is being directly interpreted) However, it is an approach that will work only with known versions of the Jini lookup service that exports known implementations of a lease Any alteration of either the lease implementation or the protocol used by the Jini lookup service, even those that would be invisible to other clients of the service, would make it impossible for the device directly interpreting the IIOP protocol to interact with the new version of the service Hence this alternative, while lowest in cost with respect to the hardware and software needed by the device, is also the least reliable in the face of implementations that can change over time or that are open to alternate implementations
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