Examples of org.eclipse.osgi.storagemanager.StorageManager

org.eclipse.osgi.storagemanager.StorageManager
the storage manager org.eclipse.osgi.storagemanager.StorageManager cacheStorageManager = new StorageManager("d:/sharedFolder/bar/", false); //$NON-NLS-1$ try { cacheStorageManager.open(true); } catch (IOException e) { // Ignore the exception. The registry will be rebuilt from source. } //To read from a file java.io.File fileA = cacheStorageManager.lookup("fileA", false)); java.io.File fileB = cacheStorageManager.lookup("fileB", false)); //Do the reading code new java.io.FileOutputStream(fileA); //To write in files cacheStorageManager.add("fileC"); //add the file to the filemanager (in this case we assume it is not already here) cacheStorageManager.add("fileD"); // The file is never written directly into the file name, so we create some temporary file java.io.File fileC = cacheStorageManager.createTempFile("fileC"); java.io.File fileD = cacheStorageManager.createTempFile("fileD"); //Do the actual writing here... //Finally update the storagemanager with the actual file to manage. cacheStorageManager.update(new String[] {"fileC", "fileD"}, new String[] {fileC.getName(), fileD.getName()}; //Close the file manager at the end cacheStorageManager.close();

Implementation details
The following implementation details are provided to help with understanding the behavior of this class. The general principle is to maintain a table which maps user-level file names onto an actual disk files. If a file needs to be modified, it is stored into a new file. The old content is not removed from disk until all entities have closed there instance of the storage manager. Once the instance has been created, open() must be called before performing any other operation. On open the storage manager obtains a snapshot of the current managed files contents. If an entity updates a managed file, the storage manager will save the content for that instance of the storage manager, all other storage manager instances will still have access to that managed file's content as it was when the instance was first opened.
@since 3.2

    Location parentConfiguration = null;
    Location currentConfiguration = LocationManager.getConfigurationLocation();
    if (currentConfiguration != null && (parentConfiguration = currentConfiguration.getParentLocation()) != null) {
      try {
        File stateLocationDir = new File(parentConfiguration.getURL().getFile(), FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME);
        StorageManager newFileManager = initFileManager(stateLocationDir, "none", true); //$NON-NLS-1$);
        for (int i = 0; i < storageFiles.length; i++)
          storageFiles[i] = newFileManager.lookup(fileNames[i], false);
        newFileManager.close();
      } catch (IOException ex) {
        if (Debug.DEBUG && Debug.DEBUG_GENERAL) {
          Debug.println("Error reading state file " + ex.getMessage()); //$NON-NLS-1$
          Debug.printStackTrace(ex);
        }

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      Location currentConfiguration = LocationManager.getConfigurationLocation();
      Location parentConfiguration = null;
      if (currentConfiguration != null && (parentConfiguration = currentConfiguration.getParentLocation()) != null) {
        try {
          File bundledataLocationDir = new File(parentConfiguration.getURL().getFile(), FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME);
          StorageManager newStorageManager = initFileManager(bundledataLocationDir, "none", true); //$NON-NLS-1$
          storageStream = newStorageManager.getInputStream(fileName);
          newStorageManager.close();
        } catch (MalformedURLException e1) {
          // This will not happen since all the URLs are derived by us
          // and we are GODS!
        } catch (IOException e1) {
          // That's ok we will regenerate the .bundleData

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      if (location == null)
        return false;
      File theStorageDir = new File(location.getURL().getPath() + '/' + Activator.PI_APP);
      if (storageManager == null) {
        boolean readOnly = location.isReadOnly();
        storageManager = new StorageManager(theStorageDir, readOnly ? "none" : null, readOnly); //$NON-NLS-1$
        storageManager.open(!readOnly);
      }
      File dataFile = storageManager.lookup(fileName, false);
      if (dataFile == null || !dataFile.isFile()) {
        Location parent = location.getParentLocation();
        if (parent != null) {
          theStorageDir = new File(parent.getURL().getPath() + '/' + Activator.PI_APP);
          StorageManager tmp = new StorageManager(theStorageDir, "none", true); //$NON-NLS-1$
          tmp.open(false);
          dataFile = tmp.lookup(fileName, false);
          tmp.close();
        }
      }
      if (dataFile == null || !dataFile.isFile())
        return true;
      if (FILE_APPLOCKS.equals(fileName))

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  protected void setFileManager(File cacheBase, boolean isCacheReadOnly) {
    if (cacheStorageManager != null)
      cacheStorageManager.close(); // close existing file manager first


    if (cacheBase != null) {
      cacheStorageManager = new StorageManager(cacheBase, isCacheReadOnly ? "none" : null, isCacheReadOnly); //$NON-NLS-1$
      try {
        cacheStorageManager.open(!isCacheReadOnly);
      } catch (IOException e) {
        // Ignore the exception. The registry will be rebuilt from source.
      }

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org.eclipse.core.internal.registry.ExtensionRegistry

org.eclipse.equinox.internal.app.AppPersistence

org.eclipse.osgi.internal.baseadaptor.BaseStorage

org.eclipse.osgi.internal.resolver.StateObjectFactoryImpl

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