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.camel.component.wasm;
  
  import java.io.InputStream;
  
  import com.dylibso.chicory.wasm.Parser;
  import com.dylibso.chicory.wasm.WasmModule;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.spi.Resource;
  import org.apache.camel.spi.ResourceLoader;
  import org.apache.camel.support.DefaultProducer;
  import org.apache.camel.support.PluginHelper;
  import org.apache.camel.wasm.WasmFunction;
  import org.apache.camel.wasm.WasmSupport;
  
  public class WasmProducer extends DefaultProducer {
  
      private final String functionModule;
      private final String functionName;
  
      private WasmModule module;
      private WasmFunction function;
  
      public WasmProducer(Endpoint endpoint, String functionModule, String functionName) throws Exception {
          super(endpoint);
  
          this.functionModule = functionModule;
          this.functionName = functionName;
      }
  
      @Override
      public void doInit() throws Exception {
          final ResourceLoader rl = PluginHelper.getResourceLoader(getEndpoint().getCamelContext());
          final Resource res = rl.resolveResource(this.functionModule);
  
          try (InputStream is = res.getInputStream()) {
              this.module = Parser.parse(is);
          }
      }
  
      @Override
      public void doStart() throws Exception {
          super.doStart();
  
          if (this.module != null && this.function == null) {
              this.function = new WasmFunction(this.module, this.functionName);
          }
      }
  
      @Override
      public void doStop() throws Exception {
          super.doStop();
  
          this.function = null;
      }
  
      @Override
      public void doShutdown() throws Exception {
          super.doShutdown();
  
          this.function = null;
          this.module = null;
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          byte[] in = WasmSupport.serialize(exchange);
          byte[] result = function.run(in);
  
          WasmSupport.deserialize(result, exchange);
      }
  }
  