Exercises in Java

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1214 Exercises
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1:Write a server which implements the RemoteInputStream interface 2:Write a server which implements the RemoteOutputStream interface 3:Implement a trivial file retrieval system using the RemoteInputStream and RemoteOutputStream discussed above and implementations of the following interfaces: Code View: Scroll / Show All
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public interface RemoteFileFactory extends Remote { RemoteFile getRootFile() throws RemoteException;
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} public interface RemoteFile extends Remote { // These methods mimic javaioFile boolean isDir() throws RemoteException, IOException; boolean isFile() throws RemoteException, IOException; long lastModified() throws RemoteException, IOException; long length() throws RemoteException, IOException; RemoteFile[] listFiles() throws RemoteException, IOException; RemoteFile[] listFiles(FilenameFilter) throws RemoteException, IOException; // I/O accessors InputStream getInputStream() throws RemoteException, IOException; // Controversial OutputStream getOutputStream() throws RemoteException, IOException; }
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Obviously RemoteFile is a remote adapter for a javaioFile at the server The interfaces in this exercise provide a means of obtaining an initial RemoteFile representing some directory, and of traversing that directory to any depth obtaining RemoteFiles contained in it Once a desired file has been found, an InputStream can be obtained for it, and its contents read Also, an OutputStream can be obtained for it, and its contents overwritten 4:Write a client for the previous exercise which recursively traverses RemoteFiles, starting with one returned by the RemoteFileFactory, until it finds a file of a certain name, and prints out the contents of that file For example, the client could print out its own source code
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1215 Remarks on the examples and exercises
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The examples and exercises appear to provide a framework for a simple software or data distribution system Please note that they are provided for illustrative purposes only, with the intention of demonstrating adapters and proxies for familiar interfaces, rather than solving the remote I/O problem As a matter of fact, they exhibit some impractical, indeed undesirable, features for that purpose
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RemoteInputStream provides nothing that can't be done with a simple HTTP URL to the same file, assuming that an HTTP server exists at the remote RemoteOutputStream provides write access to servers: this is generally quite undesirable on security grounds the system would create large numbers of RemoteFile objects at the server when traversing a directory structure of any size The read and skip methods of RemoteInputStream, and the write methods of
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RemoteOutputStream, are not idempotent: they rely on the server's and client's notions of current stream position staying in synchroniszation[14]
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[14]
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You would solve these problems by adding a long startpos parameter to all these methods, so that only the client would have to maintain its current position; but this would destroy the purpose of the examples, which is symmetry with InputStream and OutputStream
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The JavaSpaces technology provides a higher level means of achieving the same objectives as these exercises
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13 Naming II JNDI and Jini
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JNDI JNDI operations Providers Examples Other features and setup Other JNDI Service providers Naming in Jini Exercises
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131 In this chapter
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This chapter describes the Java Naming and Directory Interface (JNDI) and the Jini Discovery and Lookup Services 6 introduced the RMI registry, which provides a namespace for registering RMI servers, thus providing a "bootstrap" mechanism by which an RMI client can obtain an initial remote reference The RMI registry only implements a "flat" namespace, and is subject to elementary security restrictions For example, RMI servers can only be bound to an RMI registry running in the same host as the program which does the binding For a more powerful naming solution, we need to look further afield
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132 JNDI
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JNDI provides naming and directory functions to Java applications It is independent of any specific naming or directory service implementation Its architecture consists of an API which provides a uniform interface to the various supported naming services, and a service provider's Interface (SPI) which specifies a back end interface to be implemented by the plugin or "provider" for each such naming service JNDI ships with service providers for:
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the RMI registry the CORBA COS Naming service[1]
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The COS Naming service is specified by the Object Management Group OMG specifications are available at http://wwwomgorg
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the Lightweight Directory Access Protocol (LDAP)[2]
LDAP is specified by IETF RFCs 1777 (LDAP v2) and 2251 to 2256 (LDAP v3)