Mysterious java idiom
While I was browsing through the java.util.concurrent source code, I noticed widespread use of the following idiom
1 2 3 4 5 6 7 8 9 10 | private final ReentrantLock mainLock = new ReentrantLock(); ... //local reference to final member variable final ReentrantLock mainLock = this.mainLock; mainLock.lock(); try { ... } finally { mainLock.unlock();} |
Given that member mainLock is final, I could not understand the benefit of declaring a local reference. Continue reading “Java library performance optimzation using local references to final members: should you use it?”