Java同步和性能方面

I just realized that I need to synchronize a significant amount of data collection code in an aspect but performance is a real concern. If performance degrades too much my tool will be thrown out. I will be writing ints and longs individually and to various arrays, ArrayLists and Maps. There will be multiple threads of an application that will make function calls that will be picked up by my aspect. What kind of things should I look out for that will negatively affect performance? What code patterns are more efficient?

特别是我有一个调用许多其他数据记录方法的方法:

void foo() {
    bar();
    woz();
    ...
}

void bar() {
    f++; // f is a field of the aspect
    for (int i = 0; i < ary.length; i++) {
        // get some values from aspect point cut
        if (some condiction) {
            ary[i] += someValue; // ary a field of the aspect
        }
     }
 }

private final Object syncObject = new Object();

ArrayList<Integer> a = new ArrayList<Integer>();

void bar() {    
    synchronize(a) {
        // synchronized code
    }
}