how to handle concurrency in java servlets

Question

In my doPost method of the servlet I need to access a file (shared resource ) and update the file . How do I cater to some 100 users using this at the same time ?

Regards, Mithun

Marko · Accepted Answer · 2010-01-25 13:31:45Z

6

Create separate singleton class for file access.
Use Read and WriteLock from java.util.concurent package to protect file access.
Cache, so that you won't have to do file read if all you have to do is to return file content.

answered Jan 25, 2010 at 13:31

Marko

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Licky Lindsay · Accepted Answer · 2010-01-25 13:34:49Z

3

Are you sure a file is how you want to handle this? Protecting access to data by multiple concurrent users is most of what a modern database does.

answered Jan 25, 2010 at 13:34

Licky Lindsay

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KLE · Accepted Answer · 2010-01-25 13:35:07Z

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With high level of concurrency (for writes), synchronizing will cost you a lot of throughput.

Databases are more adequate to handle this, if possible in your project.

answered Jan 25, 2010 at 13:35

KLE

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dj_segfault · Accepted Answer · 2010-01-25 14:08:19Z

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I would take advantage of the java.util.concurrent packages added in Java 1.5. Specifically a BlockingQueue to queue up requests and handle them in a second pool of threads.

answered Jan 25, 2010 at 14:08

dj_segfault

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