org.apache.hadoop.chukwa.datastore.UserStore.java Source code

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Here is the source code for org.apache.hadoop.chukwa.datastore.UserStore.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
 *
 *     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.chukwa.datastore;

import java.io.File;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONArray;
import org.json.JSONObject;

import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
import org.apache.hadoop.chukwa.hicc.HiccWebServer;
import org.apache.hadoop.chukwa.rest.bean.UserBean;
import org.apache.hadoop.chukwa.util.ExceptionUtil;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class UserStore {
    private String uid = null;
    private UserBean profile = null;
    private static Log log = LogFactory.getLog(UserStore.class);
    private static Configuration config = new Configuration();
    private static ChukwaConfiguration chukwaConf = new ChukwaConfiguration();
    private static String hiccPath = config.get("fs.default.name") + File.separator
            + chukwaConf.get("chukwa.data.dir") + File.separator + "hicc" + File.separator + "users";

    public UserStore() throws IllegalAccessException {
        UserStore.config = HiccWebServer.getConfig();
    }

    public UserStore(String uid) throws IllegalAccessException {
        this.uid = uid;
        init(uid);
    }

    public void init(String uid) throws IllegalAccessException {
        StringBuilder profilePath = new StringBuilder();
        profilePath.append(hiccPath);
        profilePath.append(File.separator);
        profilePath.append(uid);
        profilePath.append(".profile");
        Path profileFile = new Path(profilePath.toString());
        FileSystem fs;
        try {
            fs = FileSystem.get(config);
            if (fs.exists(profileFile)) {
                FileStatus[] fstatus = fs.listStatus(profileFile);
                long size = fstatus[0].getLen();
                FSDataInputStream viewStream = fs.open(profileFile);
                byte[] buffer = new byte[(int) size];
                viewStream.readFully(buffer);
                viewStream.close();
                try {
                    JSONObject json = new JSONObject(new String(buffer));
                    profile = new UserBean(json);
                } catch (Exception e) {
                    log.error(ExceptionUtil.getStackTrace(e));
                    throw new IllegalAccessException("Unable to access user profile database.");
                }
            } else {
                profile = new UserBean();
                profile.setId(uid);
                JSONArray ja = new JSONArray();
                profile.setViews(ja);
                JSONObject json = new JSONObject();
                profile.setProperties(json.toString());
            }
        } catch (IOException ex) {
            log.error(ExceptionUtil.getStackTrace(ex));
        }
    }

    public UserBean get() throws IllegalAccessException {
        if (profile == null) {
            init(uid);
        }
        return profile;
    }

    public void set(UserBean profile) throws IllegalAccessException {
        StringBuilder profilePath = new StringBuilder();
        profilePath.append(hiccPath);
        profilePath.append(File.separator);
        profilePath.append(profile.getId());
        profilePath.append(".profile");
        Path profileFile = new Path(profilePath.toString());
        FileSystem fs;
        try {
            fs = FileSystem.get(config);
            FSDataOutputStream out = fs.create(profileFile, true);
            out.write(profile.deserialize().toString().getBytes());
            out.close();
        } catch (IOException ex) {
            log.error(ExceptionUtil.getStackTrace(ex));
            throw new IllegalAccessException("Unable to access user profile database.");
        }
        this.profile = profile;
    }

    public static JSONArray list() throws IllegalAccessException {
        StringBuilder profilePath = new StringBuilder();
        profilePath.append(hiccPath);
        profilePath.append(File.separator);
        profilePath.append("*.profile");
        Path viewFile = new Path(profilePath.toString());
        FileSystem fs;
        JSONArray list = new JSONArray();
        try {
            fs = FileSystem.get(config);
            FileStatus[] fstatus = fs.listStatus(viewFile);
            if (fstatus != null) {
                for (int i = 0; i < fstatus.length; i++) {
                    long size = fstatus[i].getLen();
                    FSDataInputStream profileStream = fs.open(fstatus[i].getPath());
                    byte[] buffer = new byte[(int) size];
                    profileStream.readFully(buffer);
                    profileStream.close();
                    try {
                        UserBean user = new UserBean(new JSONObject(new String(buffer)));
                        list.put(user.getId());
                    } catch (Exception e) {
                        log.error(ExceptionUtil.getStackTrace(e));
                    }
                }
            }
        } catch (IOException ex) {
            log.error(ExceptionUtil.getStackTrace(ex));
            throw new IllegalAccessException("Unable to access user profile database.");
        }
        return list;
    }
}