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Appendix B Example Code
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} } } package chat; import netjinicorediscoveryLookupLocator; import netjinicoreentryEntry; import netjinicorelookupServiceID; import import import import import netjinidiscoveryDiscoveryManagement; netjinidiscoveryLookupDiscoveryManager; netjinileaseLeaseRenewalManager; netjinilookupJoinManager; netjinilookupServiceIDListener;
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import comsunjinireliableLogLogHandler; import comsunjinireliableLogReliableLog; import import import import import import import import import import import import import import javaioFile; javaioFileInputStream; javaioInputStream; javaioIOException; javaioObjectInputStream; javaioObjectOutputStream; javaioOutputStream; javarmiactivationActivatable; javarmiactivationActivationID; javarmiMarshalledObject; javautilArrayList; javautilHashSet; javautilList; javautilSet;
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/** * The implementation of <CODE>ChatServer</CODE> This runs inside an * activation group defined by the persistent state from the activation * service * * @exclude ReliableLogHandler */ public class ChatServerImpl implements ChatServer { /** * The join manager we're using */ private JoinManager joinMgr; /** * Our subject of discussion */ private String subject; /** * The set of known speakers */ private Set speakers = new HashSet(); /** * The list of messages */ private List messages = new ArrayList(); /** * The list of service attributes */ private List attrs; /** * The service ID (or <CODE>null</CODE>) */ private ServiceID serviceID;
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/** * Our persistent storage */ private ChatStore store; /** * 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 lease renewal manager for all servers in our group * We share it because this gives it more leases it might be * able to compress into single renewal messages */ private static LeaseRenewalManager renewer = new LeaseRenewalManager(); /** * The storage for a <CODE>ChatServerImpl</CODE> */ class ChatStore extends LogHandler implements ServiceIDListener { /** * The reliable log in which we store our state */ private ReliableLog log; /** * Create a new <CODE>ChatStore</CODE> object for the given * directory The directory is the full path for the specific * storage for this chat on the subject The parent directory * is the one for the group */ ChatStore(File dir) throws IOException { // If the directory exists, recover from it Otherwise // create it as a a new subject if (direxists()) { log = new ReliableLog(dirtoString(), this); logrecover(); } else { subject = dirgetName(); log = new ReliableLog(dirtoString(), this); attrs = new ArrayList(); attrsadd(new ChatSubject(subject)); logsnapshot(); } // Read in the lookup groups and lookupURL for our service ObjectInputStream in = null; try { in = new ObjectInputStream( new FileInputStream( ChatServerAdmingroupFile(dirgetParentFile()))); inreadObject(); // skip over the group ID groups = (String[]) inreadObject(); lookupURL = (String) inreadObject(); } catch (ClassNotFoundException e) { unexpectedException(e); } catch (IOException e) { unexpectedException(e); } finally { if (in != null) inclose();
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Appendix B Example Code
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} } /** * Stores the current information in storage In our case only * the start state is snapshoted everything else is added * incrementally anyway and so the log of changes is the * state Part of <CODE>ReliableLogHandler</CODE> */ public void snapshot(OutputStream out) throws Exception { ObjectOutputStream oo = new ObjectOutputStream(out); oowriteObject(subject); oowriteObject(attrs); } /** * Recovers the information from storage Part of * <CODE>ReliableLogHandler</CODE> * * @see #snapshot */ public void recover(InputStream in) throws Exception { ObjectInputStream oi = new ObjectInputStream(in); subject = (String) oireadObject(); attrs = (List) oireadObject(); } /** * Apply an update from the log during recovery The types * of data we add happen to all be distinct so we know exactly * what something is based on its type alone (lucky us) Part * of <CODE>ReliableLogHandler</CODE> */ public void applyUpdate(Object update) throws Exception { if (update instanceof ChatMessage) { messagesadd(update); addSpeaker(((ChatMessage) update)getSpeaker()); } else if (update instanceof Entry) { attrsadd(update); } else if (update instanceof ServiceID) { serviceID = (ServiceID) update; } else { throw new IllegalArgumentException( "Internal error: update type " + updategetClass()getName() + ", " + update); } } /** * Invoked when the serviceID is first assigned to the service * Part of <CODE>ServiceIDListener</CODE> */ public void serviceIDNotify(ServiceID serviceID) { try { logupdate(serviceID); } catch (IOException e) { unexpectedException(e); } ChatServerImplthisserviceID = serviceID; } /** * Add a new speaker to the persistent storage log */ synchronized void add(ChatMessage msg) { try { logupdate(msg, true); } catch (IOException e) { unexpectedException(e); } }
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