49、企业级 JavaBeans 3.1 技术深入剖析

企业级 JavaBeans 3.1 技术深入剖析

1. 拦截器与 TV 频道服务示例

在 TV 频道服务示例中，涉及到了对频道访问的测试和拦截器的模拟实现。以下是相关代码示例：

{
    bean.getChannel(2);
}
// Expected
catch (final UndeclaredThrowableException ute)
{
    throw ute.getCause();
}
// Fail if we reach here
TestCase.fail("Request should have been blocked");
}
/**
 * Ensures that requests to obtain Channel 2 while open succeed
 */
@Test
public void testChannel2Allowed() throws NamingException, IOException
{
    // Set the policy to block channel 2
    Channel2AccessPolicy.setChannel2Permitted(true);
    // Invoke
    final int channel = 2;
    final InputStream stream = bean.getChannel(channel);
    // Test
    TestCase.assertEquals("Unexpected content obtained from channel " + channel, channel, strea