// Called by RegistryPlugin iff any config below RegistryPlugin.PREFIX
 // has changed
 protected void setConfig(
     Configuration config, Configuration prevConfig, Configuration.Differences changedKeys) {
   m_maxRefetchDepth =
       config.getInt(
           NewContentCrawler.PARAM_MAX_CRAWL_DEPTH, NewContentCrawler.DEFAULT_MAX_CRAWL_DEPTH);
   fetchRateLimiter = recomputeFetchRateLimiter(fetchRateLimiter);
   enablePolls = config.getBoolean(PARAM_ENABLE_REGISTRY_POLLS, DEFAULT_ENABLE_REGISTRY_POLLS);
 }
 public void setConfig(
     Configuration config, Configuration oldConfig, Configuration.Differences changedKeys) {
   //  Build list of repositories from list of disk (fs) paths).  Needs to
   //  be generalized if ever another repository implementation.
   if (changedKeys.contains(ConfigManager.PARAM_PLATFORM_DISK_SPACE_LIST)) {
     List lst = new ArrayList();
     String dspace = config.get(ConfigManager.PARAM_PLATFORM_DISK_SPACE_LIST, "");
     List paths = StringUtil.breakAt(dspace, ';');
     if (paths != null) {
       for (Iterator iter = paths.iterator(); iter.hasNext(); ) {
         lst.add("local:" + (String) iter.next());
       }
     }
     repoList = lst;
   }
   if (changedKeys.contains(PARAM_MAX_PER_AU_CACHE_SIZE)) {
     paramNodeCacheSize =
         config.getInt(PARAM_MAX_PER_AU_CACHE_SIZE, DEFAULT_MAX_PER_AU_CACHE_SIZE);
     for (Iterator iter = getDaemon().getAllLockssRepositories().iterator(); iter.hasNext(); ) {
       LockssRepository repo = (LockssRepository) iter.next();
       if (repo instanceof LockssRepositoryImpl) {
         LockssRepositoryImpl repoImpl = (LockssRepositoryImpl) repo;
         repoImpl.setNodeCacheSize(paramNodeCacheSize);
       }
     }
   }
   if (changedKeys.contains(PARAM_MAX_SUSPECT_VERSIONS_CACHE_SIZE)) {
     paramSuspectVersionsCacheSize =
         config.getInt(
             PARAM_MAX_SUSPECT_VERSIONS_CACHE_SIZE, DEFAULT_MAX_SUSPECT_VERSIONS_CACHE_SIZE);
     suspectVersionsCache.setMaxSize(paramSuspectVersionsCacheSize);
   }
   if (changedKeys.contains(GLOBAL_CACHE_PREFIX)) {
     paramIsGlobalNodeCache =
         config.getBoolean(PARAM_GLOBAL_CACHE_ENABLED, DEFAULT_GLOBAL_CACHE_ENABLED);
     if (paramIsGlobalNodeCache) {
       paramGlobalNodeCacheSize =
           config.getInt(PARAM_MAX_GLOBAL_CACHE_SIZE, DEFAULT_MAX_GLOBAL_CACHE_SIZE);
       log.debug("global node cache size: " + paramGlobalNodeCacheSize);
       globalNodeCache.setMaxSize(paramGlobalNodeCacheSize);
     }
   }
   if (changedKeys.contains(DISK_PREFIX)) {
     int minMB = config.getInt(PARAM_DISK_WARN_FRRE_MB, DEFAULT_DISK_WARN_FRRE_MB);
     double minPer =
         config.getPercentage(PARAM_DISK_WARN_FRRE_PERCENT, DEFAULT_DISK_WARN_FRRE_PERCENT);
     paramDFWarn = PlatformUtil.DF.makeThreshold(minMB, minPer);
     minMB = config.getInt(PARAM_DISK_FULL_FRRE_MB, DEFAULT_DISK_FULL_FRRE_MB);
     minPer = config.getPercentage(PARAM_DISK_FULL_FRRE_PERCENT, DEFAULT_DISK_FULL_FRRE_PERCENT);
     paramDFFull = PlatformUtil.DF.makeThreshold(minMB, minPer);
   }
   if (changedKeys.contains(PARAM_SIZE_CALC_MAX_LOAD)) {
     sizeCalcMaxLoad = config.getPercentage(PARAM_SIZE_CALC_MAX_LOAD, DEFAULT_SIZE_CALC_MAX_LOAD);
   }
   if (changedKeys.contains(PREFIX)) {
     maxUnusedDirSearch =
         config.getInt(PARAM_MAX_UNUSED_DIR_SEARCH, DEFAULT_MAX_UNUSED_DIR_SEARCH);
     isStatefulUnusedDirSearch =
         config.getBoolean(
             PARAM_IS_STATEFUL_UNUSED_DIR_SEARCH, DEFAULT_IS_STATEFUL_UNUSED_DIR_SEARCH);
     enableLongComponents =
         config.getBoolean(PARAM_ENABLE_LONG_COMPONENTS, DEFAULT_ENABLE_LONG_COMPONENTS);
     enableLongComponentsCompatibility =
         config.getBoolean(
             PARAM_ENABLE_LONG_COMPONENTS_COMPATIBILITY,
             DEFAULT_ENABLE_LONG_COMPONENTS_COMPATIBILITY);
     maxComponentLength = config.getInt(PARAM_MAX_COMPONENT_LENGTH, DEFAULT_MAX_COMPONENT_LENGTH);
     checkUnnormalized =
         (CheckUnnormalizedMode)
             config.getEnum(
                 CheckUnnormalizedMode.class,
                 PARAM_CHECK_UNNORMALIZED,
                 DEFAULT_CHECK_UNNORMALIZED);
   }
 }
  public void generateFileChunks(JspWriter out, HttpServletRequest req, Configuration conf)
      throws IOException, InterruptedException {
    long startOffset = 0;
    int datanodePort = 0;
    int chunkSizeToView = 0;

    String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);

    String filename = HtmlQuoting.unquoteHtmlChars(req.getParameter("filename"));
    if (filename == null) {
      out.print("Invalid input (filename absent)");
      return;
    }

    String blockIdStr = null;
    long blockId = 0;
    blockIdStr = req.getParameter("blockId");
    if (blockIdStr == null) {
      out.print("Invalid input (blockId absent)");
      return;
    }
    blockId = Long.parseLong(blockIdStr);

    String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);
    final DFSClient dfs = JspHelper.getDFSClient(ugi, jspHelper.nameNodeAddr, conf);

    Token<BlockTokenIdentifier> accessToken = BlockTokenSecretManager.DUMMY_TOKEN;
    if (conf.getBoolean(DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY, false)) {
      List<LocatedBlock> blks =
          dfs.namenode.getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
      if (blks == null || blks.size() == 0) {
        out.print("Can't locate file blocks");
        dfs.close();
        return;
      }
      for (int i = 0; i < blks.size(); i++) {
        if (blks.get(i).getBlock().getBlockId() == blockId) {
          accessToken = blks.get(i).getBlockToken();
          break;
        }
      }
    }

    String blockGenStamp = null;
    long genStamp = 0;
    blockGenStamp = req.getParameter("genstamp");
    if (blockGenStamp == null) {
      out.print("Invalid input (genstamp absent)");
      return;
    }
    genStamp = Long.parseLong(blockGenStamp);

    String blockSizeStr;
    long blockSize = 0;
    blockSizeStr = req.getParameter("blockSize");
    if (blockSizeStr == null) {
      out.print("Invalid input (blockSize absent)");
      return;
    }
    blockSize = Long.parseLong(blockSizeStr);

    String chunkSizeToViewStr = req.getParameter("chunkSizeToView");
    if (chunkSizeToViewStr != null && Integer.parseInt(chunkSizeToViewStr) > 0)
      chunkSizeToView = Integer.parseInt(chunkSizeToViewStr);
    else chunkSizeToView = JspHelper.getDefaultChunkSize(conf);

    String startOffsetStr = req.getParameter("startOffset");
    if (startOffsetStr == null || Long.parseLong(startOffsetStr) < 0) startOffset = 0;
    else startOffset = Long.parseLong(startOffsetStr);

    String datanodePortStr = req.getParameter("datanodePort");
    if (datanodePortStr == null) {
      out.print("Invalid input (datanodePort absent)");
      return;
    }
    datanodePort = Integer.parseInt(datanodePortStr);
    out.print("<h3>File: ");
    JspHelper.printPathWithLinks(
        HtmlQuoting.quoteHtmlChars(filename), out, namenodeInfoPort, tokenString);
    out.print("</h3><hr>");
    String parent = new File(filename).getParent();
    JspHelper.printGotoForm(out, namenodeInfoPort, tokenString, HtmlQuoting.quoteHtmlChars(parent));
    out.print("<hr>");
    out.print(
        "<a href=\"http://"
            + req.getServerName()
            + ":"
            + req.getServerPort()
            + "/browseDirectory.jsp?dir="
            + URLEncoder.encode(parent, "UTF-8")
            + "&namenodeInfoPort="
            + namenodeInfoPort
            + "\"><i>Go back to dir listing</i></a><br>");
    out.print("<a href=\"#viewOptions\">Advanced view/download options</a><br>");
    out.print("<hr>");

    // Determine the prev & next blocks
    long nextStartOffset = 0;
    long nextBlockSize = 0;
    String nextBlockIdStr = null;
    String nextGenStamp = null;
    String nextHost = req.getServerName();
    int nextPort = req.getServerPort();
    int nextDatanodePort = datanodePort;
    // determine data for the next link
    if (startOffset + chunkSizeToView >= blockSize) {
      // we have to go to the next block from this point onwards
      List<LocatedBlock> blocks =
          dfs.namenode.getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
      for (int i = 0; i < blocks.size(); i++) {
        if (blocks.get(i).getBlock().getBlockId() == blockId) {
          if (i != blocks.size() - 1) {
            LocatedBlock nextBlock = blocks.get(i + 1);
            nextBlockIdStr = Long.toString(nextBlock.getBlock().getBlockId());
            nextGenStamp = Long.toString(nextBlock.getBlock().getGenerationStamp());
            nextStartOffset = 0;
            nextBlockSize = nextBlock.getBlock().getNumBytes();
            DatanodeInfo d = jspHelper.bestNode(nextBlock);
            String datanodeAddr = d.getName();
            nextDatanodePort =
                Integer.parseInt(
                    datanodeAddr.substring(datanodeAddr.indexOf(':') + 1, datanodeAddr.length()));
            nextHost = InetAddress.getByName(d.getHost()).getCanonicalHostName();
            nextPort = d.getInfoPort();
          }
        }
      }
    } else {
      // we are in the same block
      nextBlockIdStr = blockIdStr;
      nextStartOffset = startOffset + chunkSizeToView;
      nextBlockSize = blockSize;
      nextGenStamp = blockGenStamp;
    }
    String nextUrl = null;
    if (nextBlockIdStr != null) {
      nextUrl =
          "http://"
              + nextHost
              + ":"
              + nextPort
              + "/browseBlock.jsp?blockId="
              + nextBlockIdStr
              + "&blockSize="
              + nextBlockSize
              + "&startOffset="
              + nextStartOffset
              + "&genstamp="
              + nextGenStamp
              + "&filename="
              + URLEncoder.encode(filename, "UTF-8")
              + "&chunkSizeToView="
              + chunkSizeToView
              + "&datanodePort="
              + nextDatanodePort
              + "&namenodeInfoPort="
              + namenodeInfoPort
              + JspHelper.getDelegationTokenUrlParam(tokenString);
      out.print("<a href=\"" + nextUrl + "\">View Next chunk</a>&nbsp;&nbsp;");
    }
    // determine data for the prev link
    String prevBlockIdStr = null;
    String prevGenStamp = null;
    long prevStartOffset = 0;
    long prevBlockSize = 0;
    String prevHost = req.getServerName();
    int prevPort = req.getServerPort();
    int prevDatanodePort = datanodePort;
    if (startOffset == 0) {
      List<LocatedBlock> blocks =
          dfs.namenode.getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
      for (int i = 0; i < blocks.size(); i++) {
        if (blocks.get(i).getBlock().getBlockId() == blockId) {
          if (i != 0) {
            LocatedBlock prevBlock = blocks.get(i - 1);
            prevBlockIdStr = Long.toString(prevBlock.getBlock().getBlockId());
            prevGenStamp = Long.toString(prevBlock.getBlock().getGenerationStamp());
            prevStartOffset = prevBlock.getBlock().getNumBytes() - chunkSizeToView;
            if (prevStartOffset < 0) prevStartOffset = 0;
            prevBlockSize = prevBlock.getBlock().getNumBytes();
            DatanodeInfo d = jspHelper.bestNode(prevBlock);
            String datanodeAddr = d.getName();
            prevDatanodePort =
                Integer.parseInt(
                    datanodeAddr.substring(datanodeAddr.indexOf(':') + 1, datanodeAddr.length()));
            prevHost = InetAddress.getByName(d.getHost()).getCanonicalHostName();
            prevPort = d.getInfoPort();
          }
        }
      }
    } else {
      // we are in the same block
      prevBlockIdStr = blockIdStr;
      prevStartOffset = startOffset - chunkSizeToView;
      if (prevStartOffset < 0) prevStartOffset = 0;
      prevBlockSize = blockSize;
      prevGenStamp = blockGenStamp;
    }

    String prevUrl = null;
    if (prevBlockIdStr != null) {
      prevUrl =
          "http://"
              + prevHost
              + ":"
              + prevPort
              + "/browseBlock.jsp?blockId="
              + prevBlockIdStr
              + "&blockSize="
              + prevBlockSize
              + "&startOffset="
              + prevStartOffset
              + "&filename="
              + URLEncoder.encode(filename, "UTF-8")
              + "&chunkSizeToView="
              + chunkSizeToView
              + "&genstamp="
              + prevGenStamp
              + "&datanodePort="
              + prevDatanodePort
              + "&namenodeInfoPort="
              + namenodeInfoPort
              + JspHelper.getDelegationTokenUrlParam(tokenString);
      out.print("<a href=\"" + prevUrl + "\">View Prev chunk</a>&nbsp;&nbsp;");
    }
    out.print("<hr>");
    out.print("<textarea cols=\"100\" rows=\"25\" wrap=\"virtual\" style=\"width:100%\" READONLY>");
    try {
      jspHelper.streamBlockInAscii(
          new InetSocketAddress(req.getServerName(), datanodePort),
          blockId,
          accessToken,
          genStamp,
          blockSize,
          startOffset,
          chunkSizeToView,
          out,
          conf);
    } catch (Exception e) {
      out.print(e);
    }
    out.print("</textarea>");
    dfs.close();
  }