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package com.orbekk.same;
import java.util.List;
import java.util.LinkedList;
import java.util.Map;
import java.util.HashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The implementation of a 'Same' state.
*
* This class manages the current state of the Same protocol.
*/
public class SameState extends Thread implements UrlReceiver {
private Logger logger = LoggerFactory.getLogger(getClass());
private ConnectionManager connections;
private String currentState = "";
private String networkName;
/**
* The participants of this network.
*
* Maps clientId to url.
*/
private Map<String, String> participants = new HashMap<String, String>();
/**
* The client id of this participant.
*/
private String clientId;
/**
* Stopping condition for this thread.
*/
private boolean stopped = false;
private Map<String, String> pendingParticipants =
new HashMap<String, String>();
public SameState(String networkName, String clientId,
ConnectionManager connections) {
this.networkName = networkName;
this.clientId = clientId;
this.connections = connections;
participants.put(clientId, null);
}
/**
* Get participants as a list.
*
* List format: ["clientId1,url1", "clientId2,url2", ...]
*/
public synchronized Map<String, String> getParticipants() {
return participants;
}
public String getClientId() {
return clientId;
}
public String getNetworkName() {
return networkName;
}
public String getCurrentState() {
return currentState;
}
public String getUrl() {
return participants.get(clientId);
}
@Override
public void setUrl(String url) {
logger.info("My URL is {}", url);
participants.put(clientId, url);
}
public synchronized void addParticipant(String clientId, String url) {
logger.info("PendingParticipant.add: {} ({})", clientId, url);
pendingParticipants.put(clientId, url);
notifyAll();
}
private synchronized void handleNewParticipants() {
// Adding all pending participants ensures that each of the new
// participants is informed of all participants.
//
// TODO: Does not inform old participants.
participants.putAll(pendingParticipants);
for (Map.Entry<String, String> e : pendingParticipants.entrySet()) {
String clientId = e.getKey();
String url = e.getValue();
logger.info("New participant: {} URL({})", clientId, url);
SameService remoteService = connections.getConnection(url);
remoteService.notifyParticipation(networkName, participants);
}
pendingParticipants.clear();
}
public synchronized void run() {
while (!stopped) {
handleNewParticipants();
try {
wait(1000);
} catch (InterruptedException e) {
// Ignore interrupt in wait loop.
}
}
}
public synchronized void stopSame() {
try {
stopped = true;
notifyAll();
this.join();
} catch (InterruptedException e) {
logger.warn("Got InterruptedException while waiting for SameState " +
"to finish. Ignoring.");
}
}
}
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