content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.csp.sentinel.cluster.server.codec.data;
  
  import com.alibaba.csp.sentinel.cluster.codec.EntityDecoder;
  import com.alibaba.csp.sentinel.cluster.request.data.FlowRequestData;
  
  import io.netty.buffer.ByteBuf;
  
  /**
   * <p>
   * Decoder for {@link FlowRequestData} from {@code ByteBuf} stream. The layout:
   * </p>
   * <pre>
   * | flow ID (8) | count (4) | priority flag (1) |
   * </pre>
   *
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class FlowRequestDataDecoder implements EntityDecoder<ByteBuf, FlowRequestData> {
  
      @Override
      public FlowRequestData decode(ByteBuf source) {
          if (source.readableBytes() >= 12) {
              FlowRequestData requestData = new FlowRequestData()
                  .setFlowId(source.readLong())
                  .setCount(source.readInt());
              if (source.readableBytes() >= 1) {
                  requestData.setPriority(source.readBoolean());
              }
              return requestData;
          }
          return null;
      }
  }
  