/*
* 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 org.apache.ambari.view.hive20.internal;
import com.google.common.base.Optional;
import org.apache.ambari.view.ViewContext;
import org.apache.ambari.view.commons.hdfs.ViewPropertyHelper;
import org.apache.ambari.view.hive20.Constants;
import org.apache.ambari.view.utils.hdfs.HdfsApi;
import org.apache.ambari.view.utils.hdfs.HdfsApiException;
import org.apache.ambari.view.utils.hdfs.HdfsUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class HdfsApiSupplier implements ContextSupplier<Optional<HdfsApi>> {
protected final Logger LOG =
LoggerFactory.getLogger(getClass());
private static final Map<String, HdfsApi> hdfsApiMap = new ConcurrentHashMap<>();
private final Object lock = new Object();
@Override
public Optional<HdfsApi> get(ViewContext context) {
try {
if(!hdfsApiMap.containsKey(getKey(context))) {
synchronized (lock) {
if(!hdfsApiMap.containsKey(getKey(context))) {
LOG.debug("Creating HDFSApi instance for Viewname: {}, Instance Name: {}", context.getViewName(), context.getInstanceName());
Optional<Map<String, String>> props = ViewPropertyHelper.getViewConfigs(context, Constants.VIEW_CONF_KEYVALUES);
HdfsApi api;
if(props.isPresent()){
api = HdfsUtil.connectToHDFSApi(context, props.get());
}else{
api = HdfsUtil.connectToHDFSApi(context);
}
hdfsApiMap.put(getKey(context), api);
return Optional.of(api);
}
}
}
return Optional.of(hdfsApiMap.get(getKey(context)));
} catch (HdfsApiException e) {
LOG.error("Cannot get the HDFS API", e);
return Optional.absent();
}
}
private String getKey(ViewContext context) {
return context.getUsername() + ":" + context.getInstanceName();
}
}