khotyn

#!/bin/sh
eclipseHome="/home/khotyn/softwares/eclipse_java/"
pluginName="$1"
updateSiteURL="$2"
localRepositoryHome="/home/khotyn/softwares/eclipse_plugins/"

cd $eclipseHome
./eclipse -application org.eclipse.equinox.p2.metadata.repository.mirrorApplication -source $updateSiteURL -destination "$localRepositoryHome$pluginName"
./eclipse -application org.eclipse.equinox.p2.artifact.repository.mirrorApplication -source $updateSiteURL -destination "$localRepositoryHome$pluginName"
echo "path=$localRepositoryHome$pluginName" > "$localRepositoryHome$pluginName.link"

khotyn

ASM Notes

Core API

• The ASM library is designed to work on compiled Java classes. It was also designed to be as fast and small as possible.
• ASM provides tools to read, write and transfrom such byte arrays by using higher level concepts then bytes such as numeric constants, strings, Java identifiers, Java types, Java class structure elements.
• The ASM is just a reference to the __asm__ keyword in C.
• The core API provides an event based representation of classes, while the tree API provides an object based representation.
• The CheckClassAdapter class could be used to check if the bytecode generated by ASM is valid.
• The ASMifier class could be usedd to generate the source code of ASM for generating a specific class.

khotyn

Javassist学习笔记

创建一个新类

private static void makeNewClass() throws IOException, CannotCompileException {
    ClassPool classPool = ClassPool.getDefault();
    CtClass cc = classPool.makeClass("Test");
    byte[] bytes = cc.toBytecode();
    FileOutputStream fos = new FileOutputStream("/Users/apple/Desktop/Test.class");

khotyn

Conditional Compile in Java

Considering the piece of the code above:

public class ConditionalCompile {
	private static final boolean DEBUG = false;

	public static void main(String args[]) {
 if(DEBUG){

khotyn

package com.khotyn.test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

khotyn

import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.Set;

import javax.management.MBeanServer;
import javax.management.ObjectName;

/**
 * Print the Collector used in the program.
 * @author khotyn

khotyn

java -XX:+UseConcMarkSweepGC -XX:+PrintFlagsFinal Main | grep -P "CMSInitiatingOccupancyFraction|CMSTriggerRatio|MinHeapFreeRatio"

khotyn

public static int hexStringToInt(String str) {
    if (str.length() == 8) {
        int firstBit = Integer.valueOf(str.substring(0, 1), 16);

        if (firstBit >= 8) {
            return Integer.valueOf((firstBit - 8) + str.substring(1), 16) - 0x80000000;
        } else {
            return Integer.valueOf(str, 16);
        }
    } else {

khotyn

import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AnnoMethod {
	int id() default 9;
	String value() default "Hello, world";
}

khotyn

package com.khotyn.test;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.CLASS)
@Target(ElementType.TYPE)
public @interface Anno {