Пример #1
0
  /**
   * Returns an input stream for reading the specified remote resource.<br>
   *
   * @param name the resource name
   * @return an input stream for reading the resource, or {@code null} if the resource could not be
   *     found
   */
  protected InputStream getRemoteResourceAsStream(String name) {
    try {
      log.fine("Trying to load resource " + name + " from the class provider.");

      ClassLoaderRequest request = new ClassLoaderRequest(name);
      ClassLoaderResponse response = (ClassLoaderResponse) mq.requestResponse(request, id);
      ClassLoaderOffer offer = response.getAcceptedOffer();

      log.fine("As a response to loading " + name + " received offer " + offer);

      // If a remote resource was found, store it in the cache and return it
      if (offer != null && offer.hasFiles()) {
        cache.registerOffer(offer);
        useOffer(null, offer);
        String fileLocation = cache.getFileLocation(name, offer.getName());

        // we could have got null because of wrong platform-dependent
        // separator used by user. Let's try again with fixed one.
        // (linux can use windows-style separators for escaping,
        // therefore it's not a good idea to always replace them)
        if (fileLocation == null)
          fileLocation =
              cache.getFileLocation(
                  name.replace('/', File.separatorChar).replace('\\', File.separatorChar),
                  offer.getName());

        if (fileLocation != null) {
          return new FileInputStream(fileLocation);
        } else
          log.warning(
              "The received offer does not contain the file requested or the file could not be stored: cache returned NULL");
      }
    } catch (JMSException | TimeoutException e) {
      throw new JCloudScaleException(e);
    } catch (FileNotFoundException e) {
      // Ignore
    }
    return null;
  }
Пример #2
0
  private Class<?> useOffer(String className, ClassLoaderOffer offer) {
    try {
      if (offer == null) {
        log.severe(
            "Failed to use code to resolve class " + className + " as there's no offer provided.");
        return null;
      }
      Class<?> requestedClass = null;
      // we go through all files in this offer and register them within this classloader
      for (ClassLoaderFile file : offer.getFiles()) {
        switch (file.getType()) {
          case CLASS:
            if (super.findLoadedClass(file.getName()) != null) {
              log.info("Attempting to load already loaded class: " + file.getName());
              continue;
            }

            byte[] bytecode = file.getContent();
            if (bytecode
                == null) // if there's no content in transmitted file, we have to get it from the
                         // cache.
            bytecode = cache.getClassBytecode(file.getName(), offer.getName());

            if (bytecode == null) {
              log.severe(
                  "Failed to define class " + file.getName() + " from offer " + offer.getName());
              continue;
            }

            Class<?> clazz = defineClass(file.getName(), bytecode, 0, bytecode.length);
            if (clazz.getName().equals(className)) requestedClass = clazz;

            break;

          case JAR:
            String path = cache.getFileLocation(file.getName(), offer.getName());

            if (path == null) {
              log.severe(
                  "Failed to find file " + file.getName() + " from package " + offer.getName());
              continue;
            }

            try {
              addURL(new File(path).toURI().toURL());
            } catch (MalformedURLException e) {
              log.severe("Exception while registering file " + path + ":" + e.toString());
              continue;
            }
            break;

          case ROFILE:
            //					case RWFILE:
            if (!cache.deployFile(file.getName(), offer.getName()))
              log.severe(
                  "Failed to deploy required file "
                      + file.getName()
                      + ". Failed to write file to disk.");
            break;

          default:
            log.severe(
                "Unexpected type of file ("
                    + file.getType()
                    + ") provided in the offer. skipping.");
        }
      }

      if (className != null
          && requestedClass
              == null) { // this can happen as it is possible that the required class is in the jar
        byte[] bytecode = cache.getClassBytecode(className, offer.getName());
        if (bytecode != null) requestedClass = defineClass(className, bytecode, 0, bytecode.length);
      }

      usedOffers.add(offer.getName()); // if everything is fine, we add this offer as used.

      return requestedClass;
    } catch (Throwable ex) {
      log.severe(
          "Failed to use offer "
              + (offer != null ? offer.getName() : "NULL offer ")
              + " from the cache. Removing the offer and failing...");

      if (offer != null) cache.removeOfferByName(offer.getName());

      throw ex;
    }
  }