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package com.orbekk.same;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.orbekk.same.State.Component;
public class MasterServiceImpl implements MasterService, UrlReceiver, Runnable {
private Logger logger = LoggerFactory.getLogger(getClass());
private final ConnectionManager connections;
private State state;
private boolean stopped = false;
private Broadcaster broadcaster;
private List<String> _fullStateReceivers = new ArrayList<String>();
public MasterServiceImpl(State initialState, ConnectionManager connections,
Broadcaster broadcaster) {
state = initialState;
this.connections = connections;
this.broadcaster = broadcaster;
}
@Override
public void joinNetworkRequest(String clientUrl) {
logger.info("JoinNetworkRequest({})", clientUrl);
List<String> participants = participants();
if (!participants.contains(clientUrl)) {
participants.add(clientUrl);
_fullStateReceivers.add(clientUrl);
synchronized(this) {
state.updateFromObject(".participants", participants,
state.getRevision(".participants") + 1);
notifyAll();
}
} else {
logger.warn("Client {} already part of network. " +
"Ignoring participation request", clientUrl);
}
}
public boolean _sendUpdatedComponents() {
boolean worked = false;
for (final String component : state.getAndClearUpdatedComponents()) {
logger.info("Broadcasting new component {}", state.show(component));
broadcaster.broadcast(participants(), new ServiceOperation() {
@Override public void run(String url) {
ClientService client = connections.getClient(url);
try {
client.setState(component, state.getDataOf(component),
state.getRevision(component));
} catch (Exception e) {
logger.warn("Exception when connecting to client.", e);
}
}
});
worked = true;
}
return worked;
}
public synchronized boolean _sendFullState() {
boolean hasWork = _fullStateReceivers.size() != 0;
if (hasWork) {
final List<State.Component> components = state.getComponents();
broadcaster.broadcast(_fullStateReceivers, new ServiceOperation() {
@Override public void run(String url) {
ClientService client = connections.getClient(url);
for (Component c : components) {
try {
client.setState(c.getName(), c.getData(), c.getRevision());
} catch (Exception e) {
logger.warn("Exception when connecting to client.", e);
}
}
}
});
_fullStateReceivers.clear();
}
return hasWork;
}
private List<String> participants() {
return state.getList(".participants");
}
@Override
public synchronized boolean updateStateRequest(String component,
String newData, long revision) {
boolean updated = state.update(component, newData, revision + 1);
if (updated) {
notifyAll();
}
return updated;
}
@Override
public void setUrl(String url) {
String myUrl = url + "MasterService.json";
logger.info("Master URL is " + myUrl);
state.update(".masterUrl", myUrl, 1);
}
boolean _performWork() {
boolean worked = false;
worked |= _sendUpdatedComponents();
worked |= _sendFullState();
return worked;
}
@Override
public void run() {
while (!stopped) {
if (_performWork()) {
synchronized (this) {
try {
wait(500);
} catch (InterruptedException e) {
// Ignore interrupt in wait loop.
}
}
}
}
}
}
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