/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package storm.kafka.trident;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import storm.kafka.DynamicBrokersReader;
import storm.kafka.ZkHosts;
import java.util.Map;
public class ZkBrokerReader implements IBrokerReader {
public static final Logger LOG = LoggerFactory.getLogger(ZkBrokerReader.class);
GlobalPartitionInformation cachedBrokers;
DynamicBrokersReader reader;
long lastRefreshTimeMs;
long refreshMillis;
public ZkBrokerReader(Map conf, String topic, ZkHosts hosts) {
try {
reader = new DynamicBrokersReader(conf, hosts.brokerZkStr, hosts.brokerZkPath, topic);
cachedBrokers = reader.getBrokerInfo();
lastRefreshTimeMs = System.currentTimeMillis();
refreshMillis = hosts.refreshFreqSecs * 1000L;
} catch (java.net.SocketTimeoutException e) {
LOG.warn("Failed to update brokers", e);
}
}
@Override
public GlobalPartitionInformation getCurrentBrokers() {
long currTime = System.currentTimeMillis();
if (currTime > lastRefreshTimeMs + refreshMillis) {
try {
LOG.info("brokers need refreshing because " + refreshMillis + "ms have expired");
cachedBrokers = reader.getBrokerInfo();
lastRefreshTimeMs = currTime;
} catch (java.net.SocketTimeoutException e) {
LOG.warn("Failed to update brokers", e);
}
}
return cachedBrokers;
}
@Override
public void close() {
reader.close();
}
}