aop实现失败重试

从spring官方文档上摘录下来的，可以实现并发重试

public class ConcurrentOperationExecutor implements Ordered {

private static final int DEFAULT_MAX_RETRIES = 2;

private int maxRetries = DEFAULT_MAX_RETRIES;
private int order = 1;

public void setMaxRetries(int maxRetries) {
    this.maxRetries = maxRetries;
}

public int getOrder() {
    return this.order;
}

public void setOrder(int order) {
    this.order = order;
}

public Object doConcurrentOperation(ProceedingJoinPoint pjp) throws Throwable {
    int numAttempts = 0;
    PessimisticLockingFailureException lockFailureException;
    do {
        numAttempts++;
        try {
            return pjp.proceed();
        }
        catch(PessimisticLockingFailureException ex) {
            lockFailureException = ex;
        }
    } while(numAttempts <= this.maxRetries);
    throw lockFailureException;
}

}