Lock occurs when heavy traffic
------------------------------
Key: IBATIS-508
URL: https://issues.apache.org/jira/browse/IBATIS-508
Project: iBatis for Java
Issue Type: Bug
Components: DAO
Affects Versions: 2.3.0
Environment: all platform
Reporter: Takayuki Ikeda
Priority: Minor
In heavy traffic , lock occurs at com.ibatis.common.beans.ClassInfo#getInstance
in case of cacheEnabled = true.
It seems to be happend because of "double synchronized"
ClassInfo.java
---
private static final Map CLASS_INFO_MAP = Collections.synchronizedMap(new
HashMap());
public static ClassInfo getInstance(Class clazz) {
if (cacheEnabled) {
synchronized (clazz) {
---
I think we get more concurrency to access getInstance if the synchronized
clause in getInstance method is deleted.
There is no side-effect to do this.
#just created several useless ClassInfo objects :-)
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