Example usage for org.apache.commons.vfs CacheStrategy ON_RESOLVE

Introduction

In this page you can find the example usage for org.apache.commons.vfs CacheStrategy ON_RESOLVE.

Prototype

CacheStrategy ON_RESOLVE

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Document

Refresh the data every time you request a file from FileSystemManager#resolveFile

Usage

From source file:com.newatlanta.appengine.vfs.provider.GaeFileSystemManager.java

/**
 * Prepare for initialization. //from ww w  .j  a v  a 2 s . c  o m
 */
public void prepare(String rootPath, URL configUrl) throws FileSystemException {
    setFilesCache(new LRUFilesCache());
    setCacheStrategy(CacheStrategy.ON_RESOLVE);
    setConfiguration(configUrl);

    this.rootPath = new File(rootPath).getAbsolutePath();
}

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From source file:com.bedatadriven.renjin.appengine.AppEngineContextFactory.java

@VisibleForTesting
static FileSystemManager createFileSystemManager(LocalFileProvider localFileProvider)
        throws FileSystemException {
    try {// ww w.  j av  a 2s  . com
        JarFileProvider jarFileProvider = new AppEngineJarFileProvider();

        // this provides a fake local file system rooted in the servlet context root.
        // this is necessary because on the actual appengine platform, any queries to the ancestors
        // of the servlet context (e.g. /base) will throw a security exception

        DefaultFileSystemManager dfsm = new DefaultFileSystemManager();
        dfsm.addProvider("jar", jarFileProvider);
        dfsm.addProvider("file", localFileProvider);
        dfsm.addExtensionMap("jar", "jar");
        dfsm.setDefaultProvider(new UrlFileProvider());
        dfsm.setFilesCache(new NullFilesCache());
        dfsm.setCacheStrategy(CacheStrategy.ON_RESOLVE);
        dfsm.setBaseFile(new File("/"));
        dfsm.init();

        return dfsm;
    } catch (FileSystemException e) {
        LOG.log(Level.SEVERE, "Failed to initialize file system for development server", e);
        throw new RuntimeException(e);
    }
}

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From source file:egovframework.rte.fdl.filehandling.FilehandlingServiceTest.java

/**
 * ? ? , ?  ??  ?? ?/*from   ww w .  j  a  v a2  s .c  o  m*/
 * ?  ? ? ? .
 * @throws Exception
 */
@Test
public void testCaching() throws Exception {
    String testFolder = "d:/workspace/java/e-gov/eGovFramework/RTE/DEV/trunk/Foundation/egovframework.rte.fdl.filehandling/testfolder";
    FileSystemManager manager = VFS.getManager();

    FileObject scratchFolder = manager.resolveFile(testFolder);

    // testfolder ?  ? 
    scratchFolder.delete(Selectors.EXCLUDE_SELF);

    // ? Manager ?
    DefaultFileSystemManager fs = new DefaultFileSystemManager();
    fs.setFilesCache(manager.getFilesCache());

    // zip, jar, tgz, tar, tbz2, file
    if (!fs.hasProvider("file")) {
        fs.addProvider("file", new DefaultLocalFileProvider());
    }

    fs.setCacheStrategy(CacheStrategy.ON_RESOLVE);
    fs.init();

    // ? ? ?
    FileObject foBase2 = fs.resolveFile(testFolder);
    log.debug("## scratchFolder.getName().getPath() : " + scratchFolder.getName().getPath());

    FileObject cachedFolder = foBase2.resolveFile(scratchFolder.getName().getPath());

    // ??  ?
    FileObject[] fos = cachedFolder.getChildren();
    assertFalse(contains(fos, "file1.txt"));

    // ??
    scratchFolder.resolveFile("file1.txt").createFile();

    // ? 
    // BUT cachedFolder ? ??  ?
    fos = cachedFolder.getChildren();
    assertFalse(contains(fos, "file1.txt"));

    // 
    cachedFolder.refresh();
    // ?? 
    fos = cachedFolder.getChildren();
    assertTrue(contains(fos, "file1.txt"));

}

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From source file:egovframework.rte.fdl.filehandling.FilehandlingServiceTest.java

@Test
public void testCaching1() throws Exception {
    String testFolder = "d:/workspace/java/e-gov/eGovFramework/RTE/DEV/trunk/Foundation/egovframework.rte.fdl.filehandling/test";

    FileSystemManager manager = VFS.getManager();

    EgovFileUtil.writeFile(testFolder + "/file1.txt", text, "UTF-8");

    /*/*w w w .  jav  a 2s .c o  m*/
     * ? Manager ?
     * CacheStrategy.MANUAL      : Deal with cached data manually. Call FileObject.refresh() to refresh the object data.
     * CacheStrategy.ON_RESOLVE : Refresh the data every time you request a file from FileSystemManager.resolveFile
     * CacheStrategy.ON_CALL   : Refresh the data every time you call a method on the fileObject. You'll use this only if you really need the latest info as this setting is a major performance loss. 
     */
    DefaultFileSystemManager fs = new DefaultFileSystemManager();
    fs.setFilesCache(manager.getFilesCache());

    // zip, jar, tgz, tar, tbz2, file
    if (!fs.hasProvider("file")) {
        fs.addProvider("file", new DefaultLocalFileProvider());
    }
    //       StandardFileSystemManager fs = new StandardFileSystemManager();

    fs.setCacheStrategy(CacheStrategy.ON_RESOLVE);
    fs.init();

    // ? ? ?
    //FileObject foBase2 = fs.resolveFile(testFolder);
    log.debug("####1");
    FileObject cachedFile = fs.toFileObject(new File(testFolder + "/file1.txt"));
    log.debug("####2");

    FilesCache filesCache = fs.getFilesCache();
    log.debug("####3");
    filesCache.putFile(cachedFile);
    FileObject obj = filesCache.getFile(cachedFile.getFileSystem(), cachedFile.getName());

    //FileObject baseFile = fs.getBaseFile();
    //        log.debug("### cachedFile.getContent().getSize() is " + cachedFile.getContent().getSize());

    //        long fileSize = cachedFile.getContent().getSize();
    //        log.debug("#########size is " + fileSize);
    //FileObject cachedFile1 = cachedFile.resolveFile("file2.txt");

    //       FileObject scratchFolder = manager.resolveFile(testFolder);
    //       scratchFolder.delete(Selectors.EXCLUDE_SELF);

    EgovFileUtil.delete(new File(testFolder + "/file1.txt"));

    //       obj.createFile();

    //        log.debug("#########obj is " + obj.toString());
    //        log.debug("#########size is " + obj.getContent().getSize());
    log.debug("#########file is " + obj.exists());

    fs.close();
}

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