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.net;
  
  import java.io.EOFException;
  import java.nio.BufferOverflowException;
  import java.util.Set;
  import java.util.regex.Pattern;
  
  import com.google.common.collect.ImmutableSet;
  
  import ch.qos.logback.classic.spi.IThrowableProxy;
  import ch.qos.logback.classic.spi.LoggingEvent;
  import ch.qos.logback.core.filter.Filter;
  import ch.qos.logback.core.spi.FilterReply;
  
  public class LogbackFilter extends Filter
  {
      private static final Pattern ignore = Pattern.compile("(successfully connected|connection established), version =");
  
      public FilterReply decide(Object o)
      {
          if (!(o instanceof LoggingEvent))
              return FilterReply.NEUTRAL;
  
          LoggingEvent e = (LoggingEvent) o;
  //        if (ignore.matcher(e.getMessage()).find())
  //            return FilterReply.DENY;
  
          IThrowableProxy t = e.getThrowableProxy();
          if (t == null)
              return FilterReply.NEUTRAL;
  
          if (!isIntentional(t))
              return FilterReply.NEUTRAL;
  
  //        logger.info("Filtered exception {}: {}", t.getClassName(), t.getMessage());
          return FilterReply.DENY;
      }
  
      private static final Set<String> intentional = ImmutableSet.of(
          Connection.IntentionalIOException.class.getName(),
          Connection.IntentionalRuntimeException.class.getName(),
          InvalidSerializedSizeException.class.getName(),
          BufferOverflowException.class.getName(),
          EOFException.class.getName()
      );
  
      public static boolean isIntentional(IThrowableProxy t)
      {
          while (true)
          {
              if (intentional.contains(t.getClassName()))
                  return true;
  
              if (null == t.getCause())
                  return false;
  
              t = t.getCause();
          }
      }
  
  
  }
  