org.apache.hadoop.hive.ql.exec.UDFClassLoader Maven / Gradle / Ivy
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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
*
* 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.hadoop.hive.ql.exec;
import com.google.common.base.Preconditions;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import org.apache.hadoop.hive.ql.session.SessionState;
/**
* {@link UDFClassLoader} is used to dynamically register
* udf (and related) jars
*
* This was introducted to fix HIVE-11878
*
* Each session will have its own instance of {@link UDFClassLoader}
* This is to support HiveServer2 where there can be multiple
* active sessions. Addition/removal of jars/resources in one
* session should not affect other sessions.
*/
public class UDFClassLoader extends URLClassLoader {
private boolean isClosed;
public UDFClassLoader(URL[] urls) {
super(urls);
isClosed = false;
}
public UDFClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
isClosed = false;
}
@Override
public void addURL(URL url) {
Preconditions.checkState(!isClosed, getClass().getSimpleName() + " is already closed");
super.addURL(url);
}
/**
* See {@link URLClassLoader#close}
*/
public boolean isClosed() {
return isClosed;
}
@Override
public void close() throws IOException {
isClosed = true;
super.close();
}
}