Mailing List Archive

Thanks Darren.
We actually received 2 patches with this same purpose last week. I
have one of them (the shorter one) in my copy of RAMDirectory, I just
want to test it before I commit it.

If you have other suggestions or patches that you can share in the
future, please let us know.

Thanks,
Otis


--- Darren Hobbs <darren@farfetched.org> wrote:
> Hi,
>
> I'd like to submit the attached diff file as a suggestion for an
> additional factory method on the RAMDirectory class.
> The general idea is to preload a Directory into memory to allow fast
> searches at the cost of some delay at startup.
>
> I've attached a unified diff with my proposed changes.
>
> Regards,
>
> -Darren
>
> > Index:
> jakarta-lucene/src/java/org/apache/lucene/store/RAMDirectory.java
> ===================================================================
> RCS file:
>
/home/cvspublic/jakarta-lucene/src/java/org/apache/lucene/store/RAMDirectory.java,v
> retrieving revision 1.5
> diff -u -r1.5 RAMDirectory.java
> --- jakarta-lucene/src/java/org/apache/lucene/store/RAMDirectory.java
> 8 Aug 2002 17:56:19 -0000 1.5
> +++ jakarta-lucene/src/java/org/apache/lucene/store/RAMDirectory.java
> 19 Oct 2002 23:22:04 -0000
> @@ -71,6 +71,49 @@
> public RAMDirectory() {
> }
>
> + /** Constructs a RAMDirectory using the supplied {@link Directory}
> as a source. Useful for pre-loading indexes */
> + public static RAMDirectory getDirectory(Directory sourceDirectory)
> throws IOException {
> + RAMDirectory newDirectory = new RAMDirectory();
> + org.apache.lucene.store.OutputStream os = null;
> + org.apache.lucene.store.InputStream is = null;
> + try {
> + String[] files = sourceDirectory.list();
> + for (int i = 0; i < files.length; i++) {
> + String fileName = files[i];
> + os = newDirectory.createFile(fileName);
> + is = sourceDirectory.openFile(fileName);
> +
> + byte[] buf = new byte[8192];
> + long toBeRead = is.length();
> +
> + while (toBeRead > 0) {
> + int len = (int) (toBeRead > buf.length ? buf.length :
> toBeRead);
> + is.readBytes(buf, 0, len);
> + os.writeBytes(buf, len);
> +
> + toBeRead -= len;
> + }
> + is.close();
> + os.close();
> + }
> + }
> + finally {
> + try {
> + is.close();
> + }
> + catch (Exception e) {
> + // Ignore exceptions in finally block - we're either
> already throwing one, or about to return
> + }
> + try {
> + os.close();
> + }
> + catch (Exception e) {
> + // Ignore exceptions in finally block - we're either
> already throwing one, or about to return
> + }
> + }
> + return newDirectory;
> + }
> +
> /** Returns an array of strings, one for each file in the
> directory. */
> public final String[] list() {
> String[] result = new String[files.size()];
>
> > --
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