/*******************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 
 *    Kohsuke Kawaguchi
 *
 *
 *******************************************************************************/ 

package org.jvnet.hudson.test;

import hudson.FilePath;
import hudson.util.IOException2;

import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

/**
 * Allocates temporary directories and cleans it up at the end.
 *
 * @author Kohsuke Kawaguchi
 */
public class TemporaryDirectoryAllocator {

    /**
     * Remember allocated directories to delete them later.
     */
    private final Set<File> tmpDirectories = new HashSet<File>();
    /**
     * Directory in which we allocate temporary directories.
     */
    private final File base;

    public TemporaryDirectoryAllocator(File base) {
        this.base = base;
    }

    public TemporaryDirectoryAllocator() {
        this(new File(System.getProperty("java.io.tmpdir")));
    }

    /**
     * Allocates a new empty temporary directory and returns it.
     *
     * This directory will be wiped out when {@link TemporaryDirectoryAllocator}
     * gets disposed. When this method returns, the directory already exists.
     */
    public synchronized File allocate() throws IOException {
        try {
            File f = File.createTempFile("hudson", "test", base);
            f.delete();
            f.mkdirs();
            tmpDirectories.add(f);
            return f;
        } catch (IOException e) {
            throw new IOException2("Failed to create a temporary directory in " + base, e);
        }
    }

    /**
     * Deletes all allocated temporary directories.
     */
    public synchronized void dispose() throws IOException, InterruptedException {
        IOException x = null;
        for (File dir : tmpDirectories) {
            try {
                new FilePath(dir).deleteRecursive();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        tmpDirectories.clear();
    }

    /**
     * Deletes all allocated temporary directories asynchronously.
     */
    public synchronized void disposeAsync() {
        final Set<File> tbr = new HashSet<File>(tmpDirectories);
        tmpDirectories.clear();

        new Thread("Disposing " + base) {
            public void run() {
                for (File dir : tbr) {
                    try {
                        new FilePath(dir).deleteRecursive();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }
}