1 package jdk.jfr.internal;

     2 import java.io.IOException;

     3 import java.util.ArrayList;

     4 import java.util.LinkedHashSet;

     5 import java.util.Set;

     6 

     7 import jdk.jfr.internal.SecuritySupport.SafePath;

     8 

     9 // This class keeps track of files that can't be deleted

    10 // so they can a later staged be removed.

    11 final class FilePurger {

    12 

    13 	private final static Set<SafePath> paths = new LinkedHashSet<>();

    14 

    15 	public synchronized static void add(SafePath p) {

    16 		paths.add(p);

    17 		if (paths.size() > 1000) {

    18 			removeOldest();

    19 		}

    20 	}

    21 

    22 	public synchronized static void purge() {

    23 		if (paths.isEmpty()) {

    24 			return;

    25 		}

    26 

    27 		for (SafePath p : new ArrayList<>(paths)) {

    28 			if (delete(p)) {

    29 				paths.remove(p);

    30 			}

    31 		}

    32 	}

    33 

    34     private static void removeOldest() {

    35         SafePath oldest = paths.iterator().next();

    36         paths.remove(oldest);

    37     }

    38 

    39 	private static boolean delete(SafePath p) {

    40 		try {

    41 			SecuritySupport.delete(p);

    42 			return true;

    43 		} catch (IOException e) {

    44 			return false;

    45 		}

    46 	}

    47 }