public ConcurrentHClientPool(CassandraHost host) throws SQLException {
this.cassandraHost = host;
ds =
new CassandraDataSource(
cassandraHost.getHost(),
cassandraHost.getPort(),
cassandraHost.getKeyspaceName(),
cassandraHost.getUser(),
cassandraHost.getPassword());
availableConnectionQueue =
new ArrayBlockingQueue<CassandraConnectionHandle>(cassandraHost.getMaxActive(), true);
// This counter can be offset by as much as the number of threads.
activeConnectionCount = new AtomicInteger(0);
realActiveConnectionCount = new AtomicInteger(0);
numBlocked = new AtomicInteger();
active = new AtomicBoolean(true);
maxWaitTimeWhenExhausted =
cassandraHost.getMaxWaitTimeWhenExhausted() < 0
? 0
: cassandraHost.getMaxWaitTimeWhenExhausted();
for (int i = 0; i < cassandraHost.getMaxActive() / 3; i++) {
availableConnectionQueue.add(createConnection());
}
if (log.isDebugEnabled()) {
log.debug(
"Concurrent Host pool started with {} active clients; max: {} exhausted wait: {}",
new Object[] {getNumIdle(), cassandraHost.getMaxActive(), maxWaitTimeWhenExhausted});
}
}
/**
* Used when we still have room to grow. Return an Connection without having to wait on polling
* logic. (But still increment all the counters)
*
* @return
* @throws SQLException
*/
private CassandraConnectionHandle createConnection() throws SQLException {
if (log.isDebugEnabled()) {
log.debug("Creation of new connection");
}
try {
return new CassandraConnectionHandle(
ds.getConnection(cassandraHost.getUser(), cassandraHost.getPassword()), cassandraHost);
} catch (SQLException e) {
log.debug("Unable to open transport to " + cassandraHost.getName());
throw e;
}
}