Examples of org.syncany.database.VectorClock

org.syncany.database.VectorClock
Implements a vector clock that records the time stamps of all send and receive events. It contains functions to compare and merge two vector clocks.
Vector clocks are a mechanism to track events/actions across multiple distributed clients. Using vector clocks, one can determine relationships between different events. In particular:
- Event A happened before / was caused by event B (cause)
- Event B happened after / caused event B (effect)
- Event A and B happened simultaneously (no cause/effect relationship)
@author Frits de Nijs @author Peter Dijkshoorn @author Philipp C. Heckel

    PreparedStatement preparedStatement = getStatement("databaseversion.select.all.getVectorClockByDatabaseVersionId.sql");
    preparedStatement.setInt(1, databaseVersionId);


    ResultSet resultSet = preparedStatement.executeQuery();


    VectorClock vectorClock = new VectorClock();


    while (resultSet.next()) {
      vectorClock.setClock(resultSet.getString("client"), resultSet.getLong("logicaltime"));
    }
    
    resultSet.close();
    preparedStatement.close();

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    xmlOut.writeEmptyElement("client");
    xmlOut.writeAttribute("name", databaseVersion.getClient());
    
    xmlOut.writeStartElement("vectorClock");


    VectorClock vectorClock = databaseVersion.getVectorClock();      
    for (Map.Entry<String, Long> vectorClockEntry : vectorClock.entrySet()) {
      xmlOut.writeEmptyElement("client");
      xmlOut.writeAttribute("name", vectorClockEntry.getKey());
      xmlOut.writeAttribute("value", vectorClockEntry.getValue());
    }

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    else if (elementPath.equalsIgnoreCase("/database/databaseVersions/databaseVersion/header/client")) {
      String clientName = attributes.getValue("name");
      databaseVersion.setClient(clientName);
    }
    else if (elementPath.equalsIgnoreCase("/database/databaseVersions/databaseVersion/header/vectorClock")) {
      vectorClock = new VectorClock();
    }
    else if (elementPath.equalsIgnoreCase("/database/databaseVersions/databaseVersion/header/vectorClock/client")) {
      String clientName = attributes.getValue("name");
      Long clientValue = Long.parseLong(attributes.getValue("value"));

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    String client = databaseVersionHeaderMatcher.group(1);
    String vectorClockString = databaseVersionHeaderMatcher.group(2);
    long databaseVersionHeaderTime = Long.parseLong(databaseVersionHeaderMatcher.group(3));
    
    VectorClock vectorClock = createVectorClock(vectorClockString);    
    
    DatabaseVersionHeader newDatabaseVersionHeader = new DatabaseVersionHeader();
    
    newDatabaseVersionHeader.setDate(new Date(databaseVersionHeaderTime));
    newDatabaseVersionHeader.setVectorClock(vectorClock);

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    return newDatabaseVersionHeader;
  }
  
  public static VectorClock createVectorClock(String vectorClockString) throws Exception {
    String[] vectorClockElements = vectorClockString.split(",");    
    VectorClock vectorClock = new VectorClock();
    
    for (String vectorClockElement : vectorClockElements) {
      if ("".equals(vectorClockElement.trim())) {
        continue;
      }
      
      Matcher vectorClockElementMatcher = vectorClockElementPattern.matcher(vectorClockElement);
      
      if (!vectorClockElementMatcher.matches()) {
        throw new Exception("Invalid vector clock element string: "+vectorClockElement);
      }
      
      String vectorClockMachineName = vectorClockElementMatcher.group(1);
      long vectorClockTime = Long.parseLong(vectorClockElementMatcher.group(2));
      
      vectorClock.setClock(vectorClockMachineName, vectorClockTime);
    }
    
    return vectorClock;
  }

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  public static DatabaseVersion createDatabaseVersion(DatabaseVersionHeader basedOnDatabaseVersionHeader) {
    return createDatabaseVersion(basedOnDatabaseVersionHeader, new Date());
  }
  
  public static DatabaseVersion createDatabaseVersion(DatabaseVersionHeader basedOnDatabaseVersionHeader, Date date) {
    VectorClock vectorClock = (basedOnDatabaseVersionHeader != null) ? basedOnDatabaseVersionHeader.getVectorClock().clone() : new VectorClock();
    vectorClock.incrementClock("someclient");
    
    DatabaseVersion databaseVersion = new DatabaseVersion();
    
    databaseVersion.setClient("someclient");
    databaseVersion.setTimestamp(date);

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org.syncany.operations.ls_remote.LsRemoteOperation

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org.syncany.tests.database.VectorClockTest

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