Example usage for org.apache.zookeeper KeeperException.SystemErrorException KeeperException.SystemErrorException

Introduction

In this page you can find the example usage for org.apache.zookeeper KeeperException.SystemErrorException KeeperException.SystemErrorException.

Prototype

KeeperException.SystemErrorException

Source Link

Usage

From source file:com.dw.zk.DefaultZkSessionManager.java

License:Apache License

/**
 * This method ensures a ZK session is fully CONNECTED state, and not in a CONNECTING state.
 *///from   w w  w . ja va2  s .c  om
private void ensureConnectionEstablishedBeforeProceeding() throws KeeperException.SystemErrorException {
    if (logger.isDebugEnabled()) {
        logger.debug("The current Zookeeper state is " + zk.getState() + ".");
    }

    if (zk.getState() == ZooKeeper.States.CONNECTING) {
        for (int retry = 0; (retry * connectedCheckDelay) < maxConnectionWaitTime; retry++) {
            if (zk.getState() == ZooKeeper.States.CONNECTED) {
                break;
            } else {
                if (logger.isDebugEnabled()) {
                    logger.debug("Time waited for Zookeeper CONNECTED state is currently "
                            + (retry * connectedCheckDelay) + " milliseconds.");
                }

                try {
                    Thread.sleep(connectedCheckDelay);
                } catch (InterruptedException e) {
                    logger.debug("sleep interrupted");
                }
            }
        }
    }

    if (zk.getState() != ZooKeeper.States.CONNECTED) {
        if (logger.isDebugEnabled()) {
            logger.error("Zookeeper failed to achieve a CONNECTED state.  The current state is " + zk.getState()
                    + ".");
        }

        throw new KeeperException.SystemErrorException();
    }
}

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