Java virtual file in memory

In the comments to his blog entry, a few existing solutions are mentioned, in particular, Commons VFS and the JBoss Microcontainer project. Also, another use case for a filesystem of this kind can be found there:. Another solution, much less known in this context, is provided by two standalone JARs that are used within the NetBeans Platform full disclosure: I work there.

These two JARs, org-openide-filesystems. Those two JARs are all that it takes. In other words, there are no dependencies of any kind on any part of the NetBeans Platform. The filesystem that you then have is hierarchical. Basically, imagine an XML file in memory and you've got the idea. You can write folders and files into this filesystem and then you can ascribe attributes to those files. SCJP 1. Forum: Java in General. Convert InputStream to a File in Memory. Mark Hughes. Optional 'thank-you' note:.

Based on the folders' combined size, determine how much memory you want to reserve for the DB cache. After determining this value, tune the local DB back-end properties, db-cache-percent or db-cache-size and other JVM options appropriately.

Be careful to allow additional memory for the server runtime. You can test this setup by preloading the database with the local database back end by using the preload-time-limit property. Prevents external applications from forcing expensive garbage collections. If you are using jstatd or other RMI-based applications to monitor Oracle Unified Directory, you should consider using this option in order to avoid unexpected pauses. In heavy throughput environments, you should consider using this option to increase the size of the JVM young generation.

By default, the young generation is quite small, and high throughput scenarios can result in a large amount of generated garbage.

This garbage collection, in turn, causes the JVM to inadvertently promote short-lived objects into the old generation. Selects the CMS garbage collector. This garbage collector is set for low pause time. It will result in a Java application that has a lower average throughput, but much shorter CPU-intensive garbage collections. This option is required in environments that have response time constraints. Selects the parallel old generational garbage collector. This garbage collector is set for high throughput.

It will maximize the average throughput of the import-ldif utility at the cost of an occasional stop-the-world garbage collection, which is not as critical to imports.

Selects client application run-time optimizations. The application will be faster to start and more responsive due to lower compilation overheads. For example, to specify a particular JDK 1. For example, to specify that a maximum heap size of Mbytes be used for the online export, edit the line that starts with export-ldif. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to create a directory in memory? Asked 10 years, 9 months ago. Active 6 years, 10 months ago.

Viewed 7k times. Stefan K. Add a comment. Active Oldest Votes. Apache Commons VFS is another option, but it has a couple of characteristics that may cause problems for existing code and 3rd-party libraries: Files and directories in VFS are named using urls, not File objects. Community Bot 1 1 1 silver badge.