alluxio.web.WebInterfaceConfigurationServlet.java Source code

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Here is the source code for alluxio.web.WebInterfaceConfigurationServlet.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.web;

import alluxio.Configuration;
import alluxio.PropertyKey;
import alluxio.master.file.FileSystemMaster;

import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.annotation.concurrent.ThreadSafe;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet that provides data for displaying the system's configuration.
 */
@ThreadSafe
public final class WebInterfaceConfigurationServlet extends HttpServlet {
    private static final long serialVersionUID = 2134205675393443914L;
    private static final String ALLUXIO_CONF_PREFIX = "alluxio";
    private static final Set<String> ALLUXIO_CONF_EXCLUDES = new HashSet<>(
            Arrays.asList(PropertyKey.MASTER_WHITELIST.toString()));

    private final FileSystemMaster mFsMaster;

    /**
     * Creates a new instance of {@link WebInterfaceConfigurationServlet}.
     *
     * @param fsMaster file system master
     */
    public WebInterfaceConfigurationServlet(FileSystemMaster fsMaster) {
        mFsMaster = fsMaster;
    }

    /**
     * Populates attributes before redirecting to a jsp.
     *
     * @param request The {@link HttpServletRequest} object
     * @param response The {@link HttpServletResponse} object
     * @throws ServletException if the target resource throws this exception
     * @throws IOException if the target resource throws this exception
     */
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setAttribute("whitelist", mFsMaster.getWhiteList());
        request.setAttribute("configuration", getSortedProperties());

        getServletContext().getRequestDispatcher("/configuration.jsp").forward(request, response);
    }

    private SortedSet<Pair<String, String>> getSortedProperties() {
        TreeSet<Pair<String, String>> rtn = new TreeSet<>();
        for (Map.Entry<String, String> entry : Configuration.toMap().entrySet()) {
            String key = entry.getKey();
            if (key.startsWith(ALLUXIO_CONF_PREFIX) && !ALLUXIO_CONF_EXCLUDES.contains(key)) {
                rtn.add(new ImmutablePair<>(key, Configuration.get(PropertyKey.fromString(key))));
            }
        }
        return rtn;
    }
}