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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.ambari.server.audit;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.ambari.server.audit.request.RequestAuditLogger;
  import org.apache.ambari.server.audit.request.RequestAuditLoggerImpl;
  import org.apache.ambari.server.audit.request.eventcreator.RequestAuditEventCreator;
  import org.apache.ambari.server.cleanup.ClasspathScannerUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.AbstractModule;
  import com.google.inject.Scopes;
  import com.google.inject.multibindings.Multibinder;
  import com.google.inject.name.Names;
  
  public class AuditLoggerModule extends AbstractModule {
    private static final Logger LOG = LoggerFactory.getLogger(AuditLoggerModule.class);
  
    /**
     * Selectors identifying objects to be bound.
     *
     * @return a list with interface and annotation types
     */
    protected List<Class<?>> getSelectors() {
      List<Class<?>> selectorList = new ArrayList<>();
      selectorList.add(RequestAuditEventCreator.class);
      return selectorList;
    }
  
    /**
     * Gets the list of types to be excluded from bindings.
     *
     * @return a list with types to be left out from dynamic bindings
     */
    protected List<Class<?>> getExclusions() {
      return Collections.emptyList();
    }
  
    /**
     * Returns the package to be scanned for bindings of this module.
     *
     * @return the name of the package to be scanned
     */
    protected String getPackageToScan() {
      return RequestAuditEventCreator.class.getPackage().getName();
    }
  
    @Override
    protected void configure() {
      bind(AuditLogger.class).to(AsyncAuditLogger.class);
  
      // set AuditLoggerDefaultImpl to be used by AsyncAuditLogger
      bind(AuditLogger.class).annotatedWith(Names.named(AsyncAuditLogger.InnerLogger)).to(AuditLoggerDefaultImpl.class);
  
      // binding for audit event creators
      Multibinder<RequestAuditEventCreator> multiBinder = Multibinder.newSetBinder(binder(), RequestAuditEventCreator.class);
      Set<Class<?>> bindingSet = ClasspathScannerUtils.findOnClassPath(getPackageToScan(), getExclusions(), getSelectors());
  
      for (Class clazz : bindingSet) {
        LOG.info("Binding audit event creator {}", clazz);
        multiBinder.addBinding().to(clazz).in(Scopes.SINGLETON);
      }
  
      bind(RequestAuditLogger.class).to(RequestAuditLoggerImpl.class);
    }
  }
  