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.ambari.server.stack;
  
  import java.io.File;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.NavigableMap;
  import java.util.concurrent.locks.Lock;
  import java.util.concurrent.locks.ReentrantLock;
  
  import javax.annotation.Nullable;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.controller.AmbariManagementHelper;
  import org.apache.ambari.server.metadata.ActionMetadata;
  import org.apache.ambari.server.orm.dao.ExtensionDAO;
  import org.apache.ambari.server.orm.dao.ExtensionLinkDAO;
  import org.apache.ambari.server.orm.dao.MetainfoDAO;
  import org.apache.ambari.server.orm.dao.StackDAO;
  import org.apache.ambari.server.state.StackInfo;
  import org.apache.ambari.server.state.stack.OsFamily;
  
  import com.google.inject.Inject;
  import com.google.inject.assistedinject.Assisted;
  
  /**
   * Directory tree rescans and stack modules parsing take much time on every module init.
   * This class enhances {@code}StackManager{@code} to reuse already parsed modules.
   */
  public class StackManagerMock extends StackManager {
  
    // Ensure correct behavior during the parallel test execution.
    private static final Lock lock = new ReentrantLock();
  
    // Some tests use different stack locations.
    private static final Map<ModulesPathsKey, CachedModules> pathsToCachedModulesMap = new HashMap<>();
  
    public static void invalidateKey(File stackRoot, File commonServicesRoot, File extensionRoot) {
      ModulesPathsKey pathsKey = new ModulesPathsKey(stackRoot, commonServicesRoot, extensionRoot);
      pathsToCachedModulesMap.remove(pathsKey);
    }
  
    // Paths for this instance.
    private File currentStackRoot;
    private File currentCommonServicesRoot;
    private File currentExtensionRoot;
  
    public void invalidateCurrentPaths() {
      invalidateKey(currentStackRoot, currentCommonServicesRoot, currentExtensionRoot);
    }
  
    private static class ModulesPathsKey {
      private String stackRoot;
      private String commonServicesRoot;
      private String extensionRoot;
  
      public ModulesPathsKey(File stackRoot, File commonServicesRoot, File extensionRoot) {
        this.stackRoot = stackRoot == null ? "" : stackRoot.getPath();
        this.commonServicesRoot = commonServicesRoot == null ? "" : commonServicesRoot.getPath();
        this.extensionRoot = extensionRoot == null ? "" : extensionRoot.getPath();
      }
  
      @Override
      public boolean equals(Object o) {
        if (this == o) {
          return true;
        }
        if (o == null || getClass() != o.getClass()) {
          return false;
        }
  
        ModulesPathsKey that = (ModulesPathsKey) o;
  
        if (stackRoot != null ? !stackRoot.equals(that.stackRoot) : that.stackRoot != null) {
          return false;
        }
        if (commonServicesRoot != null ? !commonServicesRoot.equals(that.commonServicesRoot) : that.commonServicesRoot != null) {
          return false;
        }
        return !(extensionRoot != null ? !extensionRoot.equals(that.extensionRoot) : that.extensionRoot != null);
  
      }
  
      @Override
      public int hashCode() {
        int result = stackRoot != null ? stackRoot.hashCode() : 0;
        result = 31 * result + (commonServicesRoot != null ? commonServicesRoot.hashCode() : 0);
        result = 31 * result + (extensionRoot != null ? extensionRoot.hashCode() : 0);
        return result;
      }
    }
  
    private static class CachedModules {
      private Map<String, ServiceModule> cachedCommonServiceModules;
      private Map<String, StackModule> cachedStackModules;
      private Map<String, ExtensionModule> cachedExtensionModules;
      private NavigableMap<String, StackInfo> cachedStackMap;
  
      public CachedModules(Map<String, ServiceModule> cachedCommonServiceModules, Map<String, StackModule> cachedStackModules,
                           Map<String, ExtensionModule> cachedExtensionModules, NavigableMap<String, StackInfo> cachedStackMap) {
        this.cachedCommonServiceModules = cachedCommonServiceModules;
        this.cachedStackModules = cachedStackModules;
        this.cachedExtensionModules = cachedExtensionModules;
        this.cachedStackMap = cachedStackMap;
      }
  
      public Map<String, ServiceModule> getCachedCommonServiceModules() {
        return cachedCommonServiceModules;
      }
  
      public Map<String, StackModule> getCachedStackModules() {
        return cachedStackModules;
      }
  
      public Map<String, ExtensionModule> getCachedExtensionModules() {
        return cachedExtensionModules;
      }
  
      public NavigableMap<String, StackInfo> getCachedStackMap() {
        return cachedStackMap;
      }
    }
  
    @Inject
    public StackManagerMock(@Assisted("stackRoot") File stackRoot, @Nullable @Assisted("commonServicesRoot")
        File commonServicesRoot, @Assisted("extensionRoot") @Nullable File extensionRoot,
                            @Assisted OsFamily osFamily, @Assisted boolean validate, MetainfoDAO metaInfoDAO,
                            ActionMetadata actionMetadata, StackDAO stackDao, ExtensionDAO extensionDao,
                            ExtensionLinkDAO linkDao, AmbariManagementHelper helper) throws AmbariException {
      super(stackRoot, commonServicesRoot, extensionRoot, osFamily, validate, metaInfoDAO, actionMetadata, stackDao, extensionDao, linkDao, helper);
      currentStackRoot = stackRoot;
      currentCommonServicesRoot = commonServicesRoot;
      currentExtensionRoot = extensionRoot;
    }
  
    @Override
    protected void parseDirectories(File stackRoot, File commonServicesRoot, File extensionRoot) throws AmbariException {
      try {
        // Ensure correct behavior during the parallel test execution.
        lock.lock();
  
        ModulesPathsKey pathsKey = new ModulesPathsKey(stackRoot, commonServicesRoot, extensionRoot);
        CachedModules cachedModules = pathsToCachedModulesMap.get(pathsKey);
  
        if (cachedModules == null) {
          super.parseDirectories(stackRoot, commonServicesRoot, extensionRoot);
          CachedModules newEntry = new CachedModules(commonServiceModules, stackModules, extensionModules, stackMap);
          pathsToCachedModulesMap.put(pathsKey, newEntry);
        } else {
          commonServiceModules = cachedModules.getCachedCommonServiceModules();
          stackModules = cachedModules.getCachedStackModules();
          extensionModules = cachedModules.getCachedExtensionModules();
          stackMap = cachedModules.getCachedStackMap();
        }
      } finally {
        lock.unlock();
      }
    }
  }
  