public synchronized void shutdown() {
if (sessions != null) {
sessions.clear();
sessions = null;
}
if (httpClient != null) {
try {
httpClient.close();
} catch (IOException e) {
log.warn("Failed to close httpClient object due to: " + e);
} finally {
httpClient = null;
}
} else {
log.error("Already shutdown.");
}
}
