package com.atlassian.plugin.spring.scanner.test.dynamic;
   
   import com.atlassian.event.api.EventPublisher;
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.PluginAccessor;
   import com.atlassian.plugin.spring.scanner.annotation.imports.ComponentImport;
   import com.atlassian.plugin.spring.scanner.dynamic.contexts.DynamicContext;
   import com.google.common.base.Joiner;
   import org.osgi.framework.BundleContext;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ConfigurableApplicationContext;
  import org.springframework.stereotype.Component;
  
  /**
   * This magic little class can dynamically cause other components to come into and out of existence.
   */
  @SuppressWarnings({"SpringJavaAutowiringInspection", "FieldCanBeLocal", "UnusedDeclaration"})
  @Component
  public class DynamicContextManager {
      private static final String[] CONFIG_PATHS = {"/dynamicProfile/dynamic-context-spring-scanner.xml"};
      private static final Joiner INTERFACE_NAME_JOINER = Joiner.on(", ");
  
      private final ApplicationContext parentContext;
      private final BundleContext bundleContext;
      private final DynamicContext.Installer dynamicContextInstaller;
      private ConfigurableApplicationContext internalContext;
  
      @Autowired
      public DynamicContextManager(@ComponentImport EventPublisher eventPublisher, @ComponentImport PluginAccessor pluginAccessor, ApplicationContext parentContext, BundleContext bundleContext) {
          this.parentContext = parentContext;
          this.bundleContext = bundleContext;
  
          final String pluginKey = "com.atlassian.plugin.atlassian-spring-scanner-maven-test";
          Plugin plugin = pluginAccessor.getPlugin(pluginKey);
          if (plugin == null) {
              throw new IllegalStateException("Plugin with key '" + pluginKey + "' was not found");
          }
  
          dynamicContextInstaller = DynamicContext.installer(eventPublisher, bundleContext, plugin.getKey());
      }
  
      public Result bootstrapTheRestOfTheApplication() {
          long then = System.currentTimeMillis();
          if (internalContext == null) {
              this.internalContext = dynamicContextInstaller.useContext(CONFIG_PATHS, parentContext);
  
              return new Result(true, then);
          } else {
              return new Result(false, then);
          }
      }
  
      public Result shutdownNewContext() {
          long then = System.currentTimeMillis();
          if (internalContext != null) {
              dynamicContextInstaller.closeAndUseContext(internalContext, internalContext.getParent());
              internalContext = null;
              return new Result(true, then);
          }
          return new Result(false, then);
      }
  
      public ConfigurableApplicationContext getInternalContext() {
          return internalContext;
      }
  
      public static class Result {
          boolean tookPlace;
          long timeTaken;
  
          Result(final boolean tookPlace, final long then) {
              this.tookPlace = tookPlace;
              this.timeTaken = System.currentTimeMillis() - then;
          }
  
          public boolean tookPlace() {
              return tookPlace;
          }
  
          public long getTimeTaken() {
              return timeTaken;
          }
      }
  }