Dec 16 2011

Java library performance optimzation using local references to final members: should you use it?

Category: javaUlrich Palha @ 9:37 am

Mysterious java idiom

While I was browsing through the java.util.concurrent source code, I noticed widespread use of the following idiom

    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?”

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Dec 09 2011

HTML Parsers and other libraries: don’t write your own till you know, and have tested, what already exists

Category: java,open sourceUlrich Palha @ 3:53 pm

It seemed simple…

I needed to extract some HTML content for one of the projects I was working on. It seemed easy enough to retrieve the content and parse out the title tag, so I quickly threw together the following code to retrieve the title tag. Continue reading “HTML Parsers and other libraries: don’t write your own till you know, and have tested, what already exists”

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