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
   *
   *     https://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.avro.grpc;
  
  import org.apache.avro.AvroRuntimeException;
  import org.apache.avro.Protocol;
  
  import java.io.InputStream;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import io.grpc.KnownLength;
  
  /** Utility methods for using Avro IDL and serialization with gRPC. */
  public final class AvroGrpcUtils {
    private static final Logger LOG = Logger.getLogger(AvroGrpcUtils.class.getName());
  
    private AvroGrpcUtils() {
    }
  
    /**
     * Provides a a unique gRPC service name for Avro RPC interface or its subclass
     * Callback Interface.
     *
     * @param iface Avro RPC interface.
     * @return unique service name for gRPC.
     */
    public static String getServiceName(Class iface) {
      Protocol protocol = getProtocol(iface);
      return protocol.getNamespace() + "." + protocol.getName();
    }
  
    /**
     * Gets the {@link Protocol} from the Avro Interface.
     */
    public static Protocol getProtocol(Class iface) {
      try {
        Protocol p = (Protocol) (iface.getDeclaredField("PROTOCOL").get(null));
        return p;
      } catch (NoSuchFieldException e) {
        throw new AvroRuntimeException("Not a Specific protocol: " + iface);
      } catch (IllegalAccessException e) {
        throw new AvroRuntimeException(e);
      }
    }
  
    /**
     * Skips any unread bytes from InputStream and closes it.
     */
    static void skipAndCloseQuietly(InputStream stream) {
      try {
        if (stream instanceof KnownLength && stream.available() > 0) {
          stream.skip(stream.available());
        } else {
          // don't expect this for an inputStream provided by gRPC but just to be on safe
          // side.
          byte[] skipBuffer = new byte[4096];
          while (true) {
            int read = stream.read(skipBuffer);
            if (read < skipBuffer.length) {
              break;
            }
          }
        }
        stream.close();
      } catch (Exception e) {
        LOG.log(Level.WARNING, "failed to skip/close the input stream, may cause memory leak", e);
      }
    }
  }
  