hengyunabc
commented
5 years ago 上面发的不能编绎，我改了下，jad可以正常工作。
import java.util.Iterator;
import java.util.Objects;
/**
*
* 字符串拼接工具类，每个线程共享一个StringBuilder，将少字符串 + 时的性能损耗，以及对最终字符长度估计不足造成数组成倍扩充造成的内存浪费。
* 如果同一个线程中嵌套使用的，后面直接new 一个
*/
public final class StrBuilderUtil {
private StringBuilder curSb = null;
private boolean useThreadBuilder;
private static final ThreadLocal<StringBuilder> THREAD_BUILDER
= ThreadLocal.withInitial(() -> new StringBuilder(64));
private static final ThreadLocal<Integer> BUILDER_STATUS = new ThreadLocal<Integer>() {
@Override
protected Integer initialValue() {
return NOT_USE;
}
};
public static final Integer NOT_USE = -1;
public static final Integer USING = 1;
private StrBuilderUtil() {
setUseThreadBuilder(false);
curSb = tryLock() ? THREAD_BUILDER.get() : new StringBuilder();
}
public static StrBuilderUtil me() {
return new StrBuilderUtil();
}
public StrBuilderUtil append(Object str) {
try {
curSb.append(str);
} catch (Exception e) {
unlock();
throw new RuntimeException(e);
}
return this;
}
@Override
public synchronized String toString() {
if (curSb == null) {
return "";
}
String str = curSb.toString();
unlock();
return str;
}
/**
* 直接获取 制定位置之间的字符，位置 可为 负数
*/
public String substring(int start, int end) {
int length = curSb.length();
if (length < 1) {
unlock();
return "";
}
if (end < 0) {
end = length + end;
}
if (start < 0) {
start = length + start;
}
if (start > end) {
unlock();
return "";
}
String substring = curSb.substring(start, end);
unlock();
return substring;
}
public static String concat(Object... args) {
if (args == null || args.length == 0) {
return "";
}
StrBuilderUtil me = StrBuilderUtil.me();
for (int i = 0; i < args.length; i++) {
// me.curSb.append(StrUtils.nvl(args[i]));
}
return me.toString();
}
public static String concat(String separator, Iterator iterator) {
if (iterator == null || !iterator.hasNext()) {
return "";
}
StrBuilderUtil me = StrBuilderUtil.me();
me.curSb.append(iterator.next());
while (iterator.hasNext()) {
me.curSb.append(separator).append(iterator.next());
}
return me.toString();
}
private boolean tryLock() {
if (Objects.equals(BUILDER_STATUS.get(), NOT_USE)) {
BUILDER_STATUS.set(USING);
setUseThreadBuilder(true);
return getUseThreadBuilder();
}
return false;
}
private void unlock() {
if (useThreadBuilder) {
BUILDER_STATUS.set(NOT_USE);
curSb.setLength(0);
setUseThreadBuilder(false);
}
}
public int length() {
return curSb.length();
}
public StrBuilderUtil delete(int start, int end) {
curSb.delete(start, end);
return this;
}
synchronized public void setUseThreadBuilder(boolean used){
this.useThreadBuilder=used;
}
synchronized public boolean getUseThreadBuilder(){
return this.useThreadBuilder;
}
}
环境信息
as.sh的版本： 3.0.5arthas-boot的版本: xxx重现问题的步骤
期望的结果
正确反编译class
实际运行的结果
Affect(row-cnt:0) cost in 152 ms.
com.swyc.core.jfinal.util.str.StrBuilderUtil source