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.knative;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.camel.AsyncCallback;
  import org.apache.camel.AsyncProcessor;
  import org.apache.camel.CamelContext;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.Processor;
  import org.apache.camel.health.HealthCheck;
  import org.apache.camel.health.HealthCheckHelper;
  import org.apache.camel.health.HealthCheckResultBuilder;
  import org.apache.camel.health.WritableHealthCheckRepository;
  import org.apache.camel.impl.health.AbstractHealthCheck;
  import org.apache.camel.impl.health.ProducersHealthCheckRepository;
  import org.apache.camel.support.AsyncProcessorConverterHelper;
  import org.apache.camel.support.DefaultAsyncProducer;
  import org.apache.camel.support.PluginHelper;
  import org.apache.camel.support.service.ServiceHelper;
  import org.apache.camel.util.ObjectHelper;
  
  public class KnativeProducer extends DefaultAsyncProducer {
      final AsyncProcessor processor;
  
      private WritableHealthCheckRepository healthCheckRepository;
      private HealthCheck producerHealthCheck;
  
      public KnativeProducer(Endpoint endpoint, Processor processor, Processor... processors) throws Exception {
          super(endpoint);
  
          List<Processor> elements = new ArrayList<>(1 + processors.length);
          elements.add(processor);
          Collections.addAll(elements, processors);
  
          CamelContext camelContext = getEndpoint().getCamelContext();
  
          Processor pipeline = PluginHelper.getProcessorFactory(camelContext).createProcessor(
                  camelContext,
                  "Pipeline",
                  new Object[] { elements });
  
          this.processor = AsyncProcessorConverterHelper.convert(pipeline);
      }
  
      @Override
      public KnativeEndpoint getEndpoint() {
          return (KnativeEndpoint) super.getEndpoint();
      }
  
      @Override
      public boolean process(Exchange exchange, AsyncCallback callback) {
          return processor.process(exchange, callback);
      }
  
      @Override
      protected void doStart() throws Exception {
          if (getEndpoint().getConfiguration().getSinkBinding() != null) {
              // health-check is optional so discover and resolve
              healthCheckRepository = HealthCheckHelper.getHealthCheckRepository(
                      getEndpoint().getCamelContext(),
                      ProducersHealthCheckRepository.REPOSITORY_ID,
                      WritableHealthCheckRepository.class);
  
              if (healthCheckRepository != null) {
                  producerHealthCheck = new SinkBindingHealthCheck(getEndpoint());
                  producerHealthCheck.setEnabled(getEndpoint().getComponent().isHealthCheckProducerEnabled());
  
                  healthCheckRepository.addHealthCheck(producerHealthCheck);
              }
          }
  
          ServiceHelper.startService(processor);
      }
  
      @Override
      protected void doStop() throws Exception {
          if (healthCheckRepository != null && producerHealthCheck != null) {
              healthCheckRepository.removeHealthCheck(producerHealthCheck);
              producerHealthCheck = null;
          }
  
          ServiceHelper.stopService(processor);
      }
  
      @Override
      protected void doSuspend() throws Exception {
          ServiceHelper.suspendService(processor);
      }
  
      @Override
      protected void doResume() throws Exception {
          ServiceHelper.resumeService(processor);
      }
  
      @Override
      protected void doShutdown() throws Exception {
          ServiceHelper.stopAndShutdownService(processor);
      }
  
      public static class SinkBindingHealthCheck extends AbstractHealthCheck {
          private final KnativeEndpoint endpoint;
  
          public SinkBindingHealthCheck(KnativeEndpoint endpoint) {
              super(endpoint.getId());
  
              this.endpoint = endpoint;
          }
  
          @Override
          protected void doCall(HealthCheckResultBuilder builder, Map<String, Object> options) {
              final String kSinkUrl = endpoint.getCamelContext().resolvePropertyPlaceholders("{{k.sink:}}");
  
              if (ObjectHelper.isNotEmpty(kSinkUrl)) {
                  builder.detail("K_SINK", kSinkUrl);
                  builder.up();
              } else {
                  builder.message("K_SINK not defined");
                  builder.down();
              }
          }
      }
  }
  