/**
* create a 1-d String array from a network, for easy transmission to R. triples (source,
* edgeType, target) are filled in to an array of length 3 * # of interactions
*
* @param network a gaggle network
* @return the edge attributes of the network as a string array
*/
protected String[] networkEdgeAttributesToStringArray(Network network) {
Interaction[] interactions = network.getInteractions();
String source, target, type;
String[] attributeNames = network.getEdgeAttributeNames();
ArrayList<String> list = new ArrayList<String>();
for (Interaction interaction : interactions) {
source = interaction.getSource();
type = interaction.getType();
target = interaction.getTarget();
String edgeName = source + " (" + type + ") " + target;
String terseEdgeName = source + "::" + target + "::" + type;
for (String name : attributeNames) {
HashMap hash = network.getEdgeAttributes(name);
if (hash.containsKey(edgeName)) {
Object value = hash.get(edgeName);
StringBuffer sb = new StringBuffer();
sb.append(terseEdgeName);
sb.append("::");
sb.append(name);
sb.append("::");
sb.append(value.toString());
list.add(sb.toString());
} else {
System.out.println("no " + name + " attribute for " + edgeName);
}
} // for a
} // for r
return list.toArray(new String[0]);
} // networkEdgeAttributesToStringArray
/** {@inheritDoc} */
public void removeHostListener(HostListener listener) {
/*
* XXX: if a disconnect method is added, make sure it calls
* this method to unregister this object from the watcher. otherwise,
* an unused MonitoredHostProvider instance may go uncollected.
*/
synchronized (listeners) {
listeners.remove(listener);
if (listeners.isEmpty() && (task != null)) {
task.cancel();
task = null;
}
}
}
/** Fire hostDisconnectEvent events. */
void fireDisconnectedEvents() {
ArrayList registered = null;
HostEvent ev = null;
synchronized (listeners) {
registered = (ArrayList) listeners.clone();
}
for (Iterator i = registered.iterator(); i.hasNext(); /* empty */ ) {
HostListener l = (HostListener) i.next();
if (ev == null) {
ev = new HostEvent(this);
}
l.disconnected(ev);
}
}
/**
* Fire VmStatusChangeEvent events to HostListener objects
*
* @param active Set of Integer objects containing the local Vm Identifiers of the active JVMs
* @param started Set of Integer objects containing the local Vm Identifiers of new JVMs started
* since last interval.
* @param terminated Set of Integer objects containing the local Vm Identifiers of terminated JVMs
* since last interval.
*/
private void fireVmStatusChangedEvents(Set active, Set started, Set terminated) {
ArrayList registered = null;
VmStatusChangeEvent ev = null;
synchronized (listeners) {
registered = (ArrayList) listeners.clone();
}
for (Iterator i = registered.iterator(); i.hasNext(); /* empty */ ) {
HostListener l = (HostListener) i.next();
if (ev == null) {
ev = new VmStatusChangeEvent(this, active, started, terminated);
}
l.vmStatusChanged(ev);
}
}
public int propose(int seq, Operation op) throws RemoteException {
if (!work) return seq;
boolean decided = false;
while (!decided) {
seq++;
ArrayList<KeyValueServerInterface> list = getServersList();
int count = 0;
int max = -1;
for (KeyValueServerInterface server : list) {
Instance ins = server.prepare(op.op_num, seq);
if (ins != null) {
count++;
if (ins.n_a > max) {
max = ins.n_a;
// content = ins.content;
op.content = ins.content;
}
}
}
if (count > (list.size() / 2)) {
if (sendAllAccept(op.op_num, seq, op.content, list)) {
for (KeyValueServerInterface server : list) {
server.decide(seq, op);
}
decided = true;
}
}
}
return seq;
}
/** {@inheritDoc} */
public void addHostListener(HostListener listener) {
synchronized (listeners) {
listeners.add(listener);
if (task == null) {
task = new NotifierTask();
timer.schedule(task, 0, interval);
}
}
}
/**
* create a 1-d String array from a network's node attributes, for easy transmission to R. use
* this format for each attribute of each node: nodeName::attributeName::value
*
* @param network a gaggle network
* @return the network's node attributes as a string array
*/
protected String[] networkNodeAttributesToStringArray(Network network) {
String[] attributeNames = network.getNodeAttributeNames();
// System.out.println (" nnatsa, attribute name count: " + attributeNames.length);
ArrayList<String> list = new ArrayList<String>();
for (String attributeName : attributeNames) {
// System.out.println (" nnatsa, attribute name: " + attributeName);
HashMap attributeHash = network.getNodeAttributes(attributeName);
// can't remove this warning until Network is genericized in next api release:
String[] nodeNames = (String[]) attributeHash.keySet().toArray(new String[0]);
for (String nodeName : nodeNames) {
// System.out.println (" nnatsa, node name: " + nodeName);
Object value = attributeHash.get(nodeName);
String terseForm = nodeName + "::" + attributeName + "::" + value.toString();
list.add(terseForm);
} // for n
} // for i
return list.toArray(new String[0]);
} // networkEdgeAttributesToStringArray
public ArrayList<KeyValueServerInterface> getServersList() throws RemoteException {
//
ArrayList<KeyValueServerInterface> res = new ArrayList();
try {
Registry registry = LocateRegistry.getRegistry();
String[] name = registry.list();
for (String str : name) {
// if( str.equals(server_name) ) continue;
KeyValueServerInterface obj = (KeyValueServerInterface) registry.lookup(str);
res.add(obj);
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return res;
}
/**
* create a 1-d String array from a network, for easy transmission to R. each element in the array
* is a string, with format sourceNode::targetNode::edgeType
*
* @param network the network to convert to a string
* @return an array of strings representing a network
*/
protected String[] networkToStringArray(Network network) {
Interaction[] interactions = network.getInteractions();
ArrayList<String> list = new ArrayList<String>();
// System.out.println ("networkToStringArray, interaction ount: " + interactions.length);
for (Interaction interaction : interactions) {
String source = interaction.getSource();
String target = interaction.getTarget();
String type = interaction.getType();
String combined = source + "::" + target + "::" + type;
// System.out.println (" interaction: " + combined);
list.add(combined);
} // for i
String[] orphanNodes = network.getOrphanNodes();
// System.out.println ("networkToStringArray, orphanCount: " + orphanNodes.length);
for (String orphanNode : orphanNodes) {
// System.out.println (" orphan: " + orphanNodes [i]);
list.add(orphanNode);
}
return list.toArray(new String[0]);
} // networkToStringArray
public boolean sendAllAccept(
int ins_num, int income_seq, String content, ArrayList<KeyValueServerInterface> list)
throws RemoteException {
int count = 0;
for (KeyValueServerInterface server : list) {
if (server.accept(ins_num, income_seq, content) != -1) count++;
}
if (count > (list.size() / 2)) return true;
return false;
}
