/*
    * 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.maven.eventspy.internal;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.eventspy.EventSpy;
  import org.apache.maven.execution.ExecutionListener;
  import org.eclipse.aether.RepositoryListener;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Dispatches callbacks to all registered EventSpies.
   * @since 3.0.2
   */
  @Named
  @Singleton
  public class EventSpyDispatcher {
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      private final List<EventSpy> eventSpies;
  
      @Inject
      public EventSpyDispatcher(List<EventSpy> eventSpies) {
          // make copy to get rid of needless overhead for dynamic lookups
          this.eventSpies = new ArrayList<>(eventSpies);
      }
  
      public ExecutionListener chainListener(ExecutionListener listener) {
          if (eventSpies.isEmpty()) {
              return listener;
          }
          return new EventSpyExecutionListener(this, listener);
      }
  
      public RepositoryListener chainListener(RepositoryListener listener) {
          if (eventSpies.isEmpty()) {
              return listener;
          }
          return new EventSpyRepositoryListener(this, listener);
      }
  
      public void init(EventSpy.Context context) {
          if (eventSpies.isEmpty()) {
              return;
          }
          for (EventSpy eventSpy : eventSpies) {
              try {
                  eventSpy.init(context);
              } catch (Exception | LinkageError e) {
                  logError("initialize", e, eventSpy);
              }
          }
      }
  
      public void onEvent(Object event) {
          if (eventSpies.isEmpty()) {
              return;
          }
          for (EventSpy eventSpy : eventSpies) {
              try {
                  eventSpy.onEvent(event);
              } catch (Exception | LinkageError e) {
                  logError("notify", e, eventSpy);
              }
          }
      }
  
      public void close() {
          if (eventSpies.isEmpty()) {
              return;
          }
          for (EventSpy eventSpy : eventSpies) {
              try {
                  eventSpy.close();
              } catch (Exception | LinkageError e) {
                  logError("close", e, eventSpy);
             }
         }
     }
 
     private void logError(String action, Throwable e, EventSpy spy) {
         String msg = "Failed to " + action + " spy " + spy.getClass().getName() + ": " + e.getMessage();
 
         if (logger.isDebugEnabled()) {
             logger.warn(msg, e);
         } else {
             logger.warn(msg);
         }
     }
 }