com.datatorrent.stram.util.SecureExecutor.java Source code

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Here is the source code for com.datatorrent.stram.util.SecureExecutor.java

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/**
 * Copyright (C) 2015 DataTorrent, Inc.
 *
 * Licensed 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 com.datatorrent.stram.util;

import java.io.IOException;
import java.security.PrivilegedAction;
import org.apache.hadoop.security.UserGroupInformation;

/**
 * Need to tie this in with some type of annotation for processing a secure workload
 *
 * @since 0.3.2
 */
public class SecureExecutor {
    public static <T> T execute(final SecureExecutor.WorkLoad<T> workLoad) throws IOException {
        if (UserGroupInformation.isSecurityEnabled()) {
            UserGroupInformation loginUser = UserGroupInformation.getLoginUser();
            return loginUser.doAs(new PrivilegedAction<T>() {
                @Override
                public T run() {
                    return workLoad.run();
                }
            });
        } else {
            return workLoad.run();
        }
    }

    public static interface WorkLoad<T> {
        public T run();
    }

}