content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * 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
   *
   * 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 io.aeron.driver;
  
  import io.aeron.CommonContext;
  import io.aeron.driver.media.UdpChannel;
  import org.agrona.LangUtil;
  
  import static io.aeron.driver.Configuration.UNICAST_FLOW_CONTROL_STRATEGY;
  
  /**
   * Default supplier of {@link FlowControl} strategies for unicast streams via
   * {@link Configuration#UNICAST_FLOW_CONTROL_STRATEGY_PROP_NAME}.
   */
  public class DefaultUnicastFlowControlSupplier implements FlowControlSupplier
  {
      /**
       * {@inheritDoc}
       */
      public FlowControl newInstance(final UdpChannel udpChannel, final int streamId, final long registrationId)
      {
          final String fcStr = udpChannel.channelUri().get(CommonContext.FLOW_CONTROL_PARAM_NAME);
          FlowControl flowControl = null;
  
          if (null != fcStr)
          {
              throw new IllegalArgumentException("unsupported unicast flow control strategy: fc=" + fcStr);
          }
  
          if (UnicastFlowControl.class.getName().equals(UNICAST_FLOW_CONTROL_STRATEGY))
          {
              return new UnicastFlowControl();
          }
  
          try
          {
              flowControl = (FlowControl)Class.forName(UNICAST_FLOW_CONTROL_STRATEGY)
                  .getConstructor()
                  .newInstance();
          }
          catch (final Exception ex)
          {
              LangUtil.rethrowUnchecked(ex);
          }
  
          return flowControl;
      }
  
      /**
       * {@inheritDoc}
       */
      public String toString()
      {
          return "DefaultUnicastFlowControlSupplier{flowControlClass=" +
              UNICAST_FLOW_CONTROL_STRATEGY + "}";
      }
  }
  