public void connect() throws CanalClientException {
while (currentConnector == null) {
SocketAddress nextAddress = this.accessStrategy.nextNode();
int times = 0;
/** retry for #retryTimes for each node when trying to connect to it. */
while (times < retryTimes) {
try {
currentConnector = new SimpleCanalConnector(nextAddress, username, password, destination);
currentConnector.setSoTimeout(soTimeout);
if (accessStrategy instanceof ClusterNodeAccessStrategy) {
currentConnector.setZkClientx(
((ClusterNodeAccessStrategy) accessStrategy).getZkClient());
}
currentConnector.connect();
break;
} catch (Exception e) {
logger.warn("failed to connect to:{} after retry {} times", nextAddress, times);
currentConnector.disconnect();
currentConnector = null;
times = times + 1;
}
}
}
}
public void unsubscribe() throws CanalClientException {
int times = 0;
while (times < retryTimes) {
try {
currentConnector.unsubscribe();
return;
} catch (Throwable t) {
logger.warn(
"something goes wrong when unsubscribing from server:{}\n{}",
currentConnector.getAddress(),
t);
times++;
restart();
logger.info("restart the connector for next round retry.");
}
}
throw new CanalClientException("failed to unsubscribe after " + times + " times retry.");
}
public void rollback(long batchId) throws CanalClientException {
int times = 0;
while (times < retryTimes) {
try {
currentConnector.rollback(batchId);
return;
} catch (Throwable t) {
logger.warn(
"something goes wrong when rollbacking data from server:{}\n{}",
currentConnector.getAddress(),
t);
times++;
restart();
logger.info("restart the connector for next round retry.");
}
}
throw new CanalClientException("failed to fetch the data after " + times + " times retry");
}
public Message getWithoutAck(int batchSize) throws CanalClientException {
int times = 0;
while (times < retryTimes) {
try {
Message msg = currentConnector.getWithoutAck(batchSize);
return msg;
} catch (Throwable t) {
logger.warn(
"something goes wrong when getWithoutAck data from server:{}\n{}",
currentConnector.getAddress(),
t);
times++;
restart();
logger.info("restart the connector for next round retry.");
}
}
throw new CanalClientException("failed to fetch the data after " + times + " times retry");
}
public void disconnect() throws CanalClientException {
if (currentConnector != null) {
currentConnector.disconnect();
currentConnector = null;
}
}
public boolean checkValid() {
return currentConnector != null && currentConnector.checkValid();
}