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The server also sets a security manager. This is a restrictive one, so it needs to be told to allow access. This can be done by setting the java.security.policy property to point to a security policy file such as policy.all. Combining all these points leads to start-ups such as this: java -Djava.rmi.server.codebase=http://myWebHost/classes/ \ -Djava.security.policy=policy.all \ rmi.FileClassifierServerRMI
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Many client/server programs communicate by message passing, often using a TCP socket. The two sides need to have an agreed-upon protocol; that is, they must have a standard set of message formats and know what messages to receive and what replies to send at any time. Jini can be used in this sort of case by providing a wrapper around the client and server, and making them available as a Jini service. The original client then becomes a proxy agent for the server and is distributed to Jini clients for execution. The original server runs within the Jini server and performs the real work of the service, just as in the thin proxy model. What differs is the class structure and how the components communicate. The proxy and the service do not need to belong to the same class, or even share common superclasses. Unlike the RMI case, the proxy is not derived from the service, so they do not have a shared class structure. The proxy and the service are written independently, using their own appropriate class hierarchies. However, the proxy still has to implement the FileClassifier interface, since that is what the client is asking for and the proxy is delivering. If RMI is not used, then any other distributed communication mechanism can be employed. Typically, client/server systems will use something like reliable TCP ports. This is not the only choice, but it is the one used in this example. Thus, the service listens on an agreed-upon port, the client connects to this port, and they exchange messages. The message format adopted for this problem is really simple: The proxy sends a message giving the file extension that it wants classified. This can be sent as a newline-terminated string. The service will either succeed or fail in the classification. If it fails, it sends a single line of the string "null" followed by a newline. If it succeeds, it sends two lines, the first being the content type and the second being the subtype. The proxy will then use this reply to return either null or a new MIMEType object.
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The proxy object will be exported completely to a Jini client, such as TestFileClassifier. When this client calls the getMIMEType() method, the proxy opens up a connection on an agreed-upon TCP port to the service and exchanges messages on this port. It then returns a suitable result. The code looks like this: package socket; import common.FileClassifier; import common.MIMEType;
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import java.net.Socket; import java.io.Serializable; import java.io.IOException; import java.rmi.Naming; import java.io.*; /** * FileClassifierProxy */ public class FileClassifierProxy implements FileClassifier, Serializable { static public final int PORT = 2981; protected String host; public FileClassifierProxy(String host) { this.host = host; } public MIMEType getMIMEType(String fileName) throws java.rmi.RemoteException { // open a connection to the service on port XXX int dotIndex = fileName.lastIndexOf('.'); if (dotIndex == -1 || dotIndex + 1 == fileName.length()) { // can't find suitable index return null; } String fileExtension = fileName.substring(dotIndex + 1); // open a client socket connection Socket socket = null; try { socket = new Socket(host, PORT); } catch(Exception e) { return null; } String type = null; String subType = null; /* * protocol: * Write: file extension * Read: "null" + '\n' * type + '\n' + subtype + '\n' */ try { InputStreamReader inputReader = new InputStreamReader(socket.getInputStream()); BufferedReader reader = new BufferedReader(inputReader); OutputStreamWriter outputWriter = new OutputStreamWriter(socket.getOutputStream()); BufferedWriter writer = new BufferedWriter(outputWriter); writer.write(fileExtension); writer.newLine();
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