EM4 Supporting Interfaces and Classes in Java

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EM4 Supporting Interfaces and Classes
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Section: Part 2: Specifications
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JS JavaSpaces Service Specification
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The Javaspaces Specification describes the JavaSpaces service defined in the package netjinijavaSpace A JavaSpaces service provides a simple yet powerful persistent coordination tool for transactionally governed cooperation between loosely coupled players in distributed protocols
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JS JavaSpaces Service Specification
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Section: JS JavaSpaces Service Specification
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Distributed systems are hard to build They require careful thinking about problems that do not occur in local computation The primary problems are those of partial failure, greatly increased latency, and language compatibility The Java programming language has a remote method invocation system called RMI that lets you approach general distributed computation in the Java programming language using techniques natural to the Java programming language and application environment This is layered on the Java platform's object serialization mechanism to marshal parameters of remote methods into a form [1] that can be shipped across the wire and unmarshalled in a remote server's Java virtual machine (JVM)
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As used in this document, the terms "Java virtual machine" or "JVM" mean a virtual machine for the Java platform This specification describes the architecture of JavaSpaces technology, which is designed to help you solve two related problems: distributed persistence and the design of distributed algorithms JavaSpaces services use RMI and the serialization feature of the Java programming language to accomplish these goals
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Section: JS JavaSpaces Service Specification
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JS2 Operations
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There are four primary kinds of operations that you can invoke on a JavaSpaces service Each operation has parameters that are entries, including some that are templates, which are a kind of entry This chapter describes entries, templates, and the details of the operations, which are: write: Write the given entry into this JavaSpaces service read: Read an entry from this JavaSpaces service that matches the given template take: Read an entry from this JavaSpaces service that matches the given template, removing it from this space notify: Notify a specified object when entries that match the given template are written into this JavaSpaces service As used in this document, the term "operation" refers to a single invocation of a method; for example, two different take operations may have different templates JS21 Entries The types Entry and UnusableEntryException that are used in this specification are from the package netjinicoreentry and are described in detail in The Jini Technology Core Platform Specification, "Entry" In the terminology of that specification write is a store operation; read and take are combination search and fetch operations; and notify sets up repeated search operations as entries are written to the space JS22 netjinispaceJavaSpace All operations are invoked on an object that implements the JavaSpace interface For example, the following code fragment would write an entry of type AttrEntry into the JavaSpaces service referred to by the identifier space:
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JavaSpace space = getSpace(); AttrEntry e = new AttrEntry(); ename = "Duke"; evalue = new GIFImage("dukeWavegif"); spacewrite(e, null, 60 * 60 * 1000);// one hour // lease is ignored one hour will be enough
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The JavaSpace interface is:
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package netjinispace; import import import import javarmi*; netjinicoreevent*; netjinicoretransaction*; netjinicorelease*;
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public interface JavaSpace { Lease write(Entry e, Transaction txn, long lease) throws RemoteException, TransactionException; public final long NO_WAIT = 0; // don't wait at all Entry read(Entry tmpl, Transaction txn, long timeout) throws TransactionException, UnusableEntryException, RemoteException, InterruptedException; Entry readIfExists(Entry tmpl, Transaction txn, long timeout)
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JS2 Operations
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throws TransactionException, UnusableEntryException, RemoteException, InterruptedException; Entry take(Entry tmpl, Transaction txn, long timeout) throws TransactionException, UnusableEntryException, RemoteException, InterruptedException; Entry takeIfExists(Entry tmpl, Transaction txn, long timeout) throws TransactionException, UnusableEntryException, RemoteException, InterruptedException; EventRegistration notify(Entry tmpl, Transaction txn, RemoteEventListener listener, long lease, MarshalledObject handback) throws RemoteException, TransactionException; Entry snapshot(Entry e) throws RemoteException; }
The Transaction and TransactionException types in the above signatures are imported from netjinicoretransaction The Lease type is imported from netjinicorelease The RemoteEventListener and EventRegistration types are imported from netjinicoreevent In all methods that have the parameter, txn may be null, which means that no Transaction object is managing the operation (see Section JS3, "Transactions") The JavaSpace interface is not a remote interface Each implementation of a JavaSpaces service exports proxy objects that implement the JavaSpace interface locally on the client, talking to the actual JavaSpaces service through an implementation specific interface An implementation of any JavaSpace method may communicate with a remote JavaSpaces service to accomplish its goal; hence, each method throws RemoteException to allow for possible failures Unless noted otherwise in this specification, when you invoke JavaSpace methods you should expect RemoteExceptions on method calls in the same cases in which you would expect them for methods invoked directly on an RMI remote reference For example, invoking snapshot might require talking to the remote JavaSpaces server, and so might get a RemoteException if the server crashes during the operation The details of each JavaSpace method are given in the sections that follow