GcStatusServlet.java example

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accumulo-master
/*
 * 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.accumulo.monitor.servlets;

import java.text.SimpleDateFormat;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.accumulo.core.gc.thrift.GCStatus;
import org.apache.accumulo.monitor.Monitor;
import org.apache.accumulo.monitor.util.Table;
import org.apache.accumulo.monitor.util.celltypes.DateTimeType;
import org.apache.accumulo.monitor.util.celltypes.DurationType;
import org.apache.accumulo.monitor.util.celltypes.NumberType;

public class GcStatusServlet extends BasicServlet {

  private static final long serialVersionUID = 1L;

  @Override
  protected String getTitle(HttpServletRequest req) {
    return "Garbage Collector Status";
  }

  @Override
  protected void pageBody(HttpServletRequest req, HttpServletResponse resp, StringBuilder sb) {
    GCStatus status = Monitor.getGcStatus();

    if (status != null) {
      Table gcActivity = new Table("gcActivity", "Collection Activity");
      gcActivity.addSortableColumn("Activity");
      gcActivity.addSortableColumn("Finished", new DateTimeType(new SimpleDateFormat("MMM dd, yyyy kk:mm")), null);
      gcActivity.addSortableColumn("Candidates", new NumberType<Long>(), null);
      gcActivity.addSortableColumn("Deleted", new NumberType<Long>(), null);
      gcActivity.addSortableColumn("In Use", new NumberType<Long>(), null);
      gcActivity.addSortableColumn("Errors", new NumberType<>(0l, 1l), null);
      gcActivity.addSortableColumn("Duration", new DurationType(), null);

      if (status.last.finished > 0)
        gcActivity.addRow("File Collection, Last Cycle", status.last.finished, status.last.candidates, status.last.deleted, status.last.inUse,
            status.last.errors, status.last.finished - status.last.started);
      if (status.current.started > 0)
        gcActivity.addRow("File Collection, Running", status.current.finished, status.current.candidates, status.current.deleted,
            status.current.inUse, status.current.errors, System.currentTimeMillis() - status.current.started);
      if (status.lastLog.finished > 0)
        gcActivity.addRow("WAL Collection, Last Cycle", status.lastLog.finished, status.lastLog.candidates, status.lastLog.deleted,
            status.lastLog.inUse, status.lastLog.errors, status.lastLog.finished - status.lastLog.started);
      if (status.currentLog.started > 0)
        gcActivity.addRow("WAL Collection, Running", status.currentLog.finished, status.currentLog.candidates, status.currentLog.deleted,
            status.currentLog.inUse, status.currentLog.errors, System.currentTimeMillis() - status.currentLog.started);
      gcActivity.generate(req, sb);
    } else {
      banner(sb, "error", "Collector is Unavailable");
    }
  }

}