Fix so that lock files created in /tmp are removed when a directory is

re-created.  This way attempts to create a new index after a crashed
indexing run no longer have to manually remove lock files from /tmp.


git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@149991 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/store/FSDirectory.java

@@ -165,6 +165,17 @@ public final class FSDirectory extends Directory {
       if (!file.delete())
         throw new IOException("couldn't delete " + files[i]);
     }
+    
+    String lockPrefix = getLockPrefix().toString(); // clear old locks
+    File tmpdir = new File(System.getProperty("java.io.tmpdir"));
+    files = tmpdir.list();
+    for (int i = 0; i < files.length; i++) {      
+      if (!files[i].startsWith(lockPrefix))
+        continue;
+      File file = new File(tmpdir, files[i]);
+      if (!file.delete())
+        throw new IOException("couldn't delete " + files[i]);
+    }
   }
 
   /** Returns an array of strings, one for each file in the directory. */
@@ -298,27 +309,9 @@ public final class FSDirectory extends Directory {
    * @return an instance of <code>Lock</code> holding the lock
    */
   public final Lock makeLock(String name) {
-    // the fully-qualified file name which uniquely identifies this lock 
-    String fullName;
-    try {
-      fullName = new File(directory, name).getCanonicalPath();
-    } catch (IOException e) {
-      throw new RuntimeException(e.toString());
-    }
-
-    // hash full name to create the tmp file name
-    byte digest[];
-    synchronized (DIGESTER) {
-      digest = DIGESTER.digest(fullName.getBytes());
-    }
-    StringBuffer buf = new StringBuffer();
-    buf.append("lucene-");
-    for (int i = 0; i < digest.length; i++) {
-      int b = digest[i];
-      buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
-      buf.append(HEX_DIGITS[b & 0xf]);
-    }
-    buf.append(".lock");
+    StringBuffer buf = getLockPrefix();
+    buf.append("-");
+    buf.append(name);
 
     // make the lock file in tmp, where anyone can create files.
     final File lockFile = new File(System.getProperty("java.io.tmpdir"),
@@ -347,6 +340,29 @@ public final class FSDirectory extends Directory {
     };
   }
 
+  private StringBuffer getLockPrefix() {
+    String dirName;                               // name to be hashed
+    try {
+      dirName = directory.getCanonicalPath();
+    } catch (IOException e) {
+      throw new RuntimeException(e.toString());
+    }
+    
+    byte digest[];
+    synchronized (DIGESTER) {
+      digest = DIGESTER.digest(dirName.getBytes());
+    }
+    StringBuffer buf = new StringBuffer();
+    buf.append("lucene-");
+    for (int i = 0; i < digest.length; i++) {
+      int b = digest[i];
+      buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
+      buf.append(HEX_DIGITS[b & 0xf]);
+    }
+
+    return buf;
+  }
+
   /** Closes the store to future operations. */
   public final synchronized void close() throws IOException {
     if (--refCount <= 0) {