/
OmTransportFactory.java
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/
OmTransportFactory.java
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/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.hadoop.ozone.om.protocolPB;
import java.io.IOException;
import java.util.Iterator;
import java.util.ServiceLoader;
import org.apache.hadoop.hdds.conf.ConfigurationSource;
import org.apache.hadoop.security.UserGroupInformation;
/**
* Factory pattern to create object for RPC communication with OM.
*/
public interface OmTransportFactory {
OmTransport createOmTransport(ConfigurationSource source,
UserGroupInformation ugi, String omServiceId) throws IOException;
static OmTransport create(ConfigurationSource conf,
UserGroupInformation ugi, String omServiceId) throws IOException {
OmTransportFactory factory = createFactory();
return factory.createOmTransport(conf, ugi, omServiceId);
}
static OmTransportFactory createFactory() throws IOException {
ServiceLoader<OmTransportFactory> transportFactoryServiceLoader =
ServiceLoader.load(OmTransportFactory.class);
Iterator<OmTransportFactory> iterator =
transportFactoryServiceLoader.iterator();
if (iterator.hasNext()) {
return iterator.next();
}
try {
return OmTransportFactory.class.getClassLoader()
.loadClass(
"org.apache.hadoop.ozone.om.protocolPB"
+ ".Hadoop3OmTransportFactory")
.asSubclass(OmTransportFactory.class)
.newInstance();
} catch (Exception ex) {
throw new IOException(
"Can't create the default OmTransport implementation", ex);
}
}
}