Java-将数据加载到内存一次，然后多次使用

Question

I have a Java program, which needs to use a function from a imported source package that loads 2GB data into the memory and use it to do the calculation.

However every time when I call the function, the loading process is processed, which is very time consuming.

My program's structure is like:

Socket Server (listening on a port)

|_ Multi Server Thread (Work as a input stream reader)

...|_ Sample Protocol (deal with the input steam using the data related functions)

I know this is a question too wide, but:

1. Are there any general idea that I can run the loading only once and use it to do all the calculation afterwards?

2. IF I import the package in the Top Level (in socket server), will that help me accelerate the loading process somehow?

3. What is the more common method used by the enterprise?

Answer 1

Since this question did not get any answer for a long time, here is a small summary:

It turns out in the current method I used, if I load the lib in the highest level (Socket Server), we can make sure that for every thread in it we don't need to load the library again.

In the enterprise level, there are better multi-thread functions for java, like:

newCachedThreadPool()

newFixedThreadPool()

newSingleThreadExecutor()

newScheduledThreadPool()

For example we can use them like,

ExecutorService fixedThreadPool() = Executors.newFixedThreadPool(4);

Future<T> future1 = singleThreadPool.submit(new MyRunnable());

singleThreadPool.execute(new MyRunnable);

singleThreadPool.shutdown();

which might be useful in real practice.