GuiceUtils.java 文件源码

/**
 * Binds an interceptor that ensures the main ClassLoader is bound as the thread context
 * {@link ClassLoader} during JNI callbacks from mesos.  Some libraries require a thread
 * context ClassLoader be set and this ensures those libraries work properly.
 *
 * @param binder The binder to use to register an interceptor with.
 * @param wrapInterface Interface whose methods should wrapped.
 */
public static void bindJNIContextClassLoader(Binder binder, Class<?> wrapInterface) {
  final ClassLoader mainClassLoader = GuiceUtils.class.getClassLoader();
  binder.bindInterceptor(
      Matchers.subclassesOf(wrapInterface),
      interfaceMatcher(wrapInterface, false),
      new MethodInterceptor() {
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
          Thread currentThread = Thread.currentThread();
          ClassLoader prior = currentThread.getContextClassLoader();
          try {
            currentThread.setContextClassLoader(mainClassLoader);
            return invocation.proceed();
          } finally {
            currentThread.setContextClassLoader(prior);
          }
        }
      });
}