MetricNode#toFatString 时间转换影响性能

[brucelwl]

Sentinel/sentinel-core/src/main/java/com/alibaba/csp/sentinel/node/metric/MetricNode.java

Lines 213 to 230 in 195150b

	public String toFatString() {
	DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	StringBuilder sb = new StringBuilder(32);
	sb.delete(0, sb.length());
	sb.append(getTimestamp()).append("|");
	sb.append(df.format(new Date(getTimestamp()))).append("|");
	String legalName = getResource().replaceAll("\\|", "_");
	sb.append(legalName).append("|");
	sb.append(getPassQps()).append("|");
	sb.append(getBlockQps()).append("|");
	sb.append(getSuccessQps()).append("|");
	sb.append(getExceptionQps()).append("|");
	sb.append(getRt()).append("|");
	sb.append(getOccupiedPassQps()).append("|");
	sb.append(concurrency).append("|");
	sb.append(classification);
	sb.append('\n');
	return sb.toString();

214行, 每次都创建新的SimpleDateFormat影响性能, 改成java8的时间吧

[manojks1999]

@brucelwl , I have made a PR please check this and let me know if any changes.

Thanks

[brucelwl]

@manojks1999 评论了,你看下

[manojks1999]

@brucelwl I could not see any comment in PR and even in code too.

[brucelwl]

@manojks1999 现在再看下