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package test;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import org.apache.log4j.Logger;
import com.nis.nmsclient.util.Utils;
class HotSwapCL extends ClassLoader {
private Logger logger = Logger.getLogger(ClassLoader.class);
private String basedir; // 需要该类加载器直接加载的类文件的基目录
private HashSet dynaclazns; // 需要由该类加载器直接加载的类名
public HotSwapCL(String basedir, String[] clazns) {
super(null); // 指定父类加载器为 null
this.basedir = basedir;
dynaclazns = new HashSet();
loadClassByMe(clazns);
}
private void loadClassByMe(String[] clazns) {
for (int i = 0; i < clazns.length; i++) {
try {
loadDirectly(clazns[i]);
} catch (Exception e) {
logger.error(Utils.printExceptionStack(e));
}
dynaclazns.add(clazns[i]);
}
}
private Class loadDirectly(String name) throws Exception{
Class cls = null;
StringBuffer sb = new StringBuffer(basedir);
String classname = name.replace('.', File.separatorChar) + ".class";
sb.append(File.separator + classname);
File classF = new File(sb.toString());
cls = instantiateClass(name, new FileInputStream(classF), classF
.length());
return cls;
}
private Class instantiateClass(String name, InputStream fin, long len) throws Exception{
byte[] raw = new byte[(int) len];
try {
fin.read(raw);
} catch (IOException e) {
throw e;
}finally{
if(fin!=null){
fin.close();
}
}
return defineClass(name, raw, 0, raw.length);
}
protected Class loadClass(String name, boolean resolve)
throws ClassNotFoundException {
Class cls = null;
cls = findLoadedClass(name);
if (!this.dynaclazns.contains(name) && cls == null)
cls = getSystemClassLoader().loadClass(name);
if (cls == null)
throw new ClassNotFoundException(name);
if (resolve)
resolveClass(cls);
return cls;
}
}
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