content: /**
   * 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 org.apache.aurora.common.net.http.handlers;
  
  import java.util.List;
  import java.util.Map;
  
  import javax.ws.rs.GET;
  import javax.ws.rs.Path;
  import javax.ws.rs.Produces;
  import javax.ws.rs.core.MediaType;
  
  import com.google.common.base.Joiner;
  import com.google.common.collect.Lists;
  
  /**
   * HTTP handler to print the stacks of all live threads.
   *
   * @author William Farner
   */
  @Path("/threads")
  public class ThreadStackPrinter {
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String getThreadStacks() {
      List<String> lines = Lists.newLinkedList();
      for (Map.Entry<Thread, StackTraceElement[]> entry : Thread.getAllStackTraces().entrySet()) {
        Thread t = entry.getKey();
        lines.add(String.format("Name: %s\nState: %s\nDaemon: %s\nID: %d",
            t.getName(), t.getState(), t.isDaemon(), t.getId()));
        for (StackTraceElement s : entry.getValue()) {
          lines.add("    " + s.toString());
        }
      }
      return Joiner.on("\n").join(lines);
    }
  }
  