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260 lines (210 loc) · 8.47 KB
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package com.pubnub.api;
import java.util.*;
public class OriginManager {
private static Logger log = new Logger(OriginManager.class);
HashSet<String> deadOrigins = new HashSet<String>();
private int interval;
private int maxRetries;
private int maxRetriesAfterFailure;
private int currentOriginManager;
private int failbackOriginManager;
private PubnubCoreShared app;
private String http;
private Callback callback;
public OriginManager(PubnubCoreShared app) {
this.app = app;
this.http = app.http();
this.interval = app.getOriginManagerInterval();
this.maxRetries = app.getOriginManagerMaxRetries();
this.maxRetriesAfterFailure = app.getOriginManagerIntervalAfterFailure();
}
public synchronized void start() {
startCurrentOriginManager();
startFailbackOriginManager();
}
public synchronized void stop() {
stopCurrentOriginManager();
stopFailbackOriginManager();
}
private void startCurrentOriginManager() {
OriginsPool originsPool = app.getOriginsPool();
if (originsPool != null && app.getOriginsPool().size() >= 2) {
currentOriginManager =
app.getTimedTaskManager().addTask("Current Origin Manager", new CurrentOriginManager(interval));
log.verbose("Current Origin Manager started");
} else {
invokeErrorCallback(PubnubError.PNERROBJ_OM_NOT_ENOUGH_ORIGINS);
}
}
private void startFailbackOriginManager() {
if (deadOrigins.size() != 0) {
failbackOriginManager =
app.getTimedTaskManager().addTask("Failback Manager", new FailbackOriginManager(interval));
restartSubscription();
log.verbose("Failback Origin Manager started");
}
}
private void stopCurrentOriginManager() {
if (currentOriginManager != 0) {
app.getTimedTaskManager().removeTask(currentOriginManager);
currentOriginManager = 0;
log.verbose("Current Origin Manager stopped");
}
}
private void stopFailbackOriginManager() {
if (failbackOriginManager != 0) {
app.getTimedTaskManager().removeTask(failbackOriginManager);
failbackOriginManager = 0;
log.verbose("Failback Origin Manager stopped");
}
}
public boolean isCurrentOriginManagerRunning() {
return currentOriginManager != 0;
}
public boolean isFailbackManagerRunning() {
return failbackOriginManager != 0;
}
public class CurrentOriginManager extends TimedTask {
Date lastAlivePingStart;
String currentOrigin;
int failures;
CurrentOriginManager(int interval) {
super(interval);
}
public void run() {
lastAlivePingStart = new Date();
OriginsPool originsPool = app.getOriginsPool();
Iterator originsIterator = originsPool.iterator();
if (!originsIterator.hasNext()) {
stop();
restartSubscription();
return;
}
try {
currentOrigin = (String) originsIterator.next();
log.verbose("Pinging origin " + currentOrigin + "." + app.getDomain() + "/time/0");
isOriginOnline(currentOrigin, new Callback() {
public void successCallback(String channel, Object message) {
failures = 0;
checkFailures();
}
public void errorCallback(String channel, PubnubError error) {
failures += 1;
checkFailures();
}
});
} catch (Exception e) {
failures += 1;
checkFailures();
}
}
private void checkFailures() {
if (failures > maxRetries) {
failures = 0;
setOriginOffline(currentOrigin);
if (app.getOriginsPool().size() == 0) {
stop();
restartSubscription();
} else if (!isFailbackManagerRunning()) {
startFailbackOriginManager();
restartSubscription();
}
}
}
}
public class FailbackOriginManager extends TimedTask {
Date lastFailbackPingStart;
String deadOriginToTest;
HashMap<String, Integer> deadOriginsSuccessCounter = new HashMap<String, Integer>();
FailbackOriginManager(int interval) {
super(interval);
}
public void run() {
synchronized (deadOrigins) {
Iterator deadOriginsIterator = deadOrigins.iterator();
lastFailbackPingStart = new Date();
try {
while (deadOriginsIterator.hasNext()) {
deadOriginToTest = (String) deadOriginsIterator.next();
isOriginOnline(deadOriginToTest, new Callback() {
public void successCallback(String channel, Object message) {
log.verbose("Dead origin " + deadOriginToTest + " is online now");
setSuccesses(deadOriginToTest);
checkSuccesses(deadOriginToTest);
}
public void errorCallback(String channel, PubnubError error) {
log.verbose("Dead origin " + deadOriginToTest + " is still offline");
setFailure(deadOriginToTest);
checkSuccesses(deadOriginToTest);
}
});
}
} catch (Exception e) {
setFailure(deadOriginToTest);
checkSuccesses(deadOriginToTest);
}
}
}
private void setSuccesses(String deadOrigin) {
Integer counter = deadOriginsSuccessCounter.get(deadOrigin);
if (counter == null) {
counter = 0;
}
counter++;
deadOriginsSuccessCounter.put(deadOrigin, counter);
}
private void setFailure(String deadOrigin) {
deadOriginsSuccessCounter.put(deadOrigin, 0);
}
private void checkSuccesses(String deadOrigin) {
Integer counter = deadOriginsSuccessCounter.get(deadOrigin);
if (counter == maxRetriesAfterFailure) {
deadOriginsSuccessCounter.remove(deadOrigin);
setOriginOnline(deadOriginToTest);
restartSubscription();
if (deadOrigins.isEmpty()) {
interruptWorker();
}
}
}
}
private void setOriginOffline(String origin) {
synchronized (this.deadOrigins) {
app.getOriginsPool().remove(origin);
deadOrigins.add(origin);
}
log.verbose("Marked origin \"" + origin + "\" as offline.");
}
private void setOriginOnline(String origin) {
synchronized (this.deadOrigins) {
deadOrigins.remove(origin);
app.getOriginsPool().add(origin);
}
log.verbose("Marked origin \"" + origin + "\" as online.");
}
private void isOriginOnline(String origin, final Callback callback) {
String[] urlComponents = new String[]{http + origin + "." + app.getDomain(), "time", "0"};
Hashtable parameters = PubnubUtil.hashtableClone(app.params);
HttpRequest hreq = new HttpRequest(urlComponents, parameters,
new ResponseHandler() {
public void handleResponse(HttpRequest hreq, String response) {
callback.successCallback(null, response);
}
public void handleError(HttpRequest hreq, PubnubError error) {
callback.errorCallback(null, error);
}
});
app._request(hreq, app.nonSubscribeManager);
}
public synchronized void setCallback(Callback callback) {
this.callback = callback;
}
private synchronized void invokeErrorCallback(PubnubError error) {
if (this.callback != null) {
this.callback.errorCallback("", error);
}
}
public void restartSubscription() {
app.disconnectAndResubscribe();
}
}