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* Implement a <code>MessageStream</code> whose * <code>nextMessage</code> method returns ''fortune cookie'' selected * at random The stream is an activatable remote object It requires * no special proxy because there is no client side state or smarts * the simple RMI stub works perfectly for this use * * <code>FortuneStreamImpl</code> objects are created using the * <code>create</code> It's only public constructor is designed for * use by the activation system itself The class * <code>FortuneAdmin</code> provides a program that will invoke * <code>create</code> * * @see FortuneAdmin */ public class FortuneStreamImpl implements FortuneStream { /** * Groups to register with (or an empty array) */ private String[] groups = new String[0]; /** * URL to specific join manager (or <CODE>null</CODE>) */ private String lookupURL; /** * The directory we work in */ private String dir; /** * The theme of this stream */ private String theme; /** * The random number generator we use */ private Random random = new Random(); /** * The positions of the start of each fortune in the file */ private long[] positions; /** * The file that contains the fortunes */ private RandomAccessFile fortunes; /** * The join manager does most work required of services in Jini systems */ private JoinManager joinMgr; /** * @param args The command line arguments */ public static void main(String[] args) throws Exception { FortuneStreamImpl f = new FortuneStreamImpl(args); fexecute(); } /** * Create a stream that reads from the given directory * * @param dir The directory name */ private FortuneStreamImpl(String args[]) throws IOException
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{ // Set the groups, lookupURL, dir, and theme // fields if (argslength != 3) { usage(); throw new IllegalArgumentException(); } if (args[0]indexOf(':') < 0) groups = utilParseUtilparseGroups(args[0]); else lookupURL = args[0]; dir = args[1]; theme = args[2]; } /** * Print out a usage message */ private void usage() { Systemerrprintln("usage: java " + FortuneStreamImplclass + " groups|lookupURL database dir theme"); } /** * Export this service as a UnicastRemoteObject for debugging purposes * * @see #main */ private void execute() throws IOException { SystemsetSecurityManager(new RMISecurityManager()); UnicastRemoteObjectexportObject(this); // set up the fortune database setupFortunes(); // set our FortuneTheme attribute FortuneTheme themeAttr = new FortuneTheme(theme); Entry[] initialAttrs = new Entry[] { themeAttr }; LookupLocator[] locators = null; if (lookupURL != null) { LookupLocator loc = new LookupLocator(lookupURL); locators = new LookupLocator[] { loc }; } DiscoveryManagement dm = new LookupDiscoveryManager(groups, locators, null); joinMgr = new JoinManager(this, initialAttrs, (ServiceIDListener) null, dm, null); } /** * Called when the database needs to be set up This can be called * multiple times, for example if the database has been modified while * the service is running * * @throws javaioIOException * Some problem occurred accessing the database files */ private synchronized void setupFortunes() throws IOException { // Read in the position of each fortune File posFile = new File(dir, "pos"); DataInputStream in = new DataInputStream( new BufferedInputStream(new FileInputStream(posFile))); int count = (int) inreadLong(); positions = new long[count]; for (int i = 0; i < positionslength; i++) positions[i] = inreadLong(); inclose(); // Close the fortune file if previously opened if (fortunes != null)
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fortunesclose(); // Open up the fortune file fortunes = new RandomAccessFile(new File(dir, "fortunes"), "r"); } /** * Return the next message from the stream Since messages are * selected at random, any message is as good as any other and so * this is idempotent by contract: there will be no violation of * the contract if the client calls it a second time after getting * a <code>RemoteException</code> The <CODE>Object</CODE> returned * is a <CODE>String</CODE> with embeded newlines, but no trailing * newline * * @throws javaioEOFException * The database has been corrupted no more messages * from this stream */ public synchronized Object nextMessage() throws EOFException { try { int which = randomnextInt(positionslength); fortunesseek(positions[which]); StringBuffer buf = new StringBuffer(); String line; while ((line = fortunesreadLine()) != null && !lineequals("%%")) { if (buflength() > 0) bufappend('\n'); bufappend(line); } return buftoString(); } catch (IOException e) { throw new EOFException("directory not available:" + egetMessage()); } } // inherit doc comment from interface public String getTheme() { return theme; } } package fortune; import netjinientryAbstractEntry; import netjinilookupentryServiceControlled; /** * This class is used as an attribute in the lookup system to tell * the user what theme of fortunes a stream generates */ public class FortuneTheme extends AbstractEntry implements ServiceControlled { /** * The serial version UID Stating it explicitly allows future * evolution with a guaranteed consistency of the UID itself It * is also more efficient since otherwise the UID must be calculated * when the class is serialized A good specification should include * the serial version UID of each class */ static final long serialVersionUID = 1696813496901296488L; /** * The theme of this collection of fortunes * * @see fortuneFortuneStream#getTheme * @serial */ public String theme;
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