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From thom...@apache.org
Subject svn commit: r1211914 - /jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java
Date Thu, 08 Dec 2011 14:43:40 GMT
Author: thomasm
Date: Thu Dec  8 14:43:40 2011
New Revision: 1211914

URL: http://svn.apache.org/viewvc?rev=1211914&view=rev
Log:
File system optimization: remember the position

Modified:
    jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java

Modified: jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java
URL: http://svn.apache.org/viewvc/jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java?rev=1211914&r1=1211913&r2=1211914&view=diff
==============================================================================
--- jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java
(original)
+++ jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/fs/FilePathDisk.java
Thu Dec  8 14:43:40 2011
@@ -349,6 +349,8 @@ class FileDisk extends FileBase {
     private final RandomAccessFile file;
     private final String name;
 
+    private long pos;
+
     FileDisk(String fileName, String mode) throws FileNotFoundException {
         this.file = new RandomAccessFile(fileName, mode);
         this.name = fileName;
@@ -362,6 +364,7 @@ class FileDisk extends FileBase {
         if (newLength < file.length()) {
             // some implementations actually only support truncate
             file.setLength(newLength);
+            pos = Math.min(pos, newLength);
         }
         return this;
     }
@@ -375,7 +378,7 @@ class FileDisk extends FileBase {
     }
 
     public long position() throws IOException {
-        return file.getFilePointer();
+        return pos;
     }
 
     public long size() throws IOException {
@@ -385,13 +388,17 @@ class FileDisk extends FileBase {
     public int read(ByteBuffer dst) throws IOException {
         int len = file.read(dst.array(), dst.position(), dst.remaining());
         if (len > 0) {
+            pos += len;
             dst.position(dst.position() + len);
         }
         return len;
     }
 
     public FileChannel position(long pos) throws IOException {
-        file.seek(pos);
+        if (this.pos != pos) {
+            file.seek(pos);
+            this.pos = pos;
+        }
         return this;
     }
 
@@ -399,6 +406,7 @@ class FileDisk extends FileBase {
         int len = src.remaining();
         file.write(src.array(), src.position(), len);
         src.position(src.position() + len);
+        pos += len;
         return len;
     }
 



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