content: /*
   * 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.cassandra.service;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.TimeoutException;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.db.TruncateResponse;
  import org.apache.cassandra.exceptions.RequestFailure;
  import org.apache.cassandra.exceptions.RequestFailureReason;
  import org.apache.cassandra.exceptions.TruncateException;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.RequestCallback;
  import org.apache.cassandra.utils.concurrent.Condition;
  import org.apache.cassandra.utils.concurrent.UncheckedInterruptedException;
  
  import static java.util.concurrent.TimeUnit.NANOSECONDS;
  import static org.apache.cassandra.config.DatabaseDescriptor.getTruncateRpcTimeout;
  import static org.apache.cassandra.utils.Clock.Global.nanoTime;
  import static org.apache.cassandra.utils.concurrent.Condition.newOneTimeCondition;
  
  public class TruncateResponseHandler implements RequestCallback<TruncateResponse>
  {
      protected static final Logger logger = LoggerFactory.getLogger(TruncateResponseHandler.class);
      protected final Condition condition = newOneTimeCondition();
      private final int responseCount;
      protected final AtomicInteger responses = new AtomicInteger(0);
      private final long start;
      private final Map<InetAddressAndPort, RequestFailureReason> failureReasonByEndpoint = new ConcurrentHashMap<>();
  
      public TruncateResponseHandler(int responseCount)
      {
          // at most one node per range can bootstrap at a time, and these will be added to the write until
          // bootstrap finishes (at which point we no longer need to write to the old ones).
          assert 1 <= responseCount: "invalid response count " + responseCount;
  
          this.responseCount = responseCount;
          start = nanoTime();
      }
  
      public void get() throws TimeoutException
      {
          long timeoutNanos = getTruncateRpcTimeout(NANOSECONDS) - (nanoTime() - start);
          boolean signaled;
          try
          {
              signaled = condition.await(timeoutNanos, NANOSECONDS); // TODO truncate needs a much longer timeout
          }
          catch (InterruptedException e)
          {
              throw new UncheckedInterruptedException(e);
          }
  
          if (!signaled)
              throw new TimeoutException("Truncate timed out - received only " + responses.get() + " responses");
  
          if (!failureReasonByEndpoint.isEmpty())
          {
              // clone to make sure no race condition happens
              Map<InetAddressAndPort, RequestFailureReason> failureReasonByEndpoint = new HashMap<>(this.failureReasonByEndpoint);
              if (RequestCallback.isTimeout(failureReasonByEndpoint))
                  throw new TimeoutException("Truncate timed out - received only " + responses.get() + " responses");
  
              StringBuilder sb = new StringBuilder("Truncate failed on ");
              for (Map.Entry<InetAddressAndPort, RequestFailureReason> e : failureReasonByEndpoint.entrySet())
                  sb.append("replica ").append(e.getKey()).append(" -> ").append(e.getValue()).append(", ");
              sb.setLength(sb.length() - 2);
              throw new TruncateException(sb.toString());
          }
      }
  
      @Override
      public void onResponse(Message<TruncateResponse> message)
      {
          responses.incrementAndGet();
          if (responses.get() >= responseCount)
              condition.signalAll();
      }
  
      @Override
      public void onFailure(InetAddressAndPort from, RequestFailure failure)
      {
          // If the truncation hasn't succeeded on some replica, abort and indicate this back to the client.
          failureReasonByEndpoint.put(from, failure.reason);
          condition.signalAll();
      }
  
      @Override
      public boolean invokeOnFailure()
      {
          return true;
      }
  }
  