Fast Reflection

java refleciton api 可以让程序变得灵活,但是速度影响很大,fast Refleciton 可以解决这个问题

速度

Fast Reflction 在我的测试中所花的时间大约是javaReflection所花时间的10%-20%

用法

public static void main(String args[])
	{
		try
		{
			int N = 100000000;
			FastReflect fr = new FastReflect();
			Method m = TestClass.class.getMethod("setAaa",
					new Class[] { int.class });
			FastMethod fm = fr.getFastMethod(m);
			TestClass test = new TestClass();
			long start = System.currentTimeMillis();
			for (int i = 0; i < N; i++)
			{
				m.invoke(test, 1);
			}
			long reflectTime = System.currentTimeMillis() - start;
			start = System.currentTimeMillis();
			for (int i = 0; i < N; i++)
			{
				fm.invoke(test, 1);
			}
			long fastReflectTime = System.currentTimeMillis() - start;
			System.out.println("Reflect:" + reflectTime);
			System.out.println("fastReflect:" + fastReflectTime);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public static class TestClass
	{
		private int	aaa;

		/**
		 * @return the aaa
		 */
		public int getAaa()
		{
			return aaa;
		}

		/**
		 * @param aaa
		 *            the aaa to set
		 */
		public void setAaa(int aaa)
		{
			this.aaa = aaa;
		}

	}