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## org.w3c.tools.resources.store
Class ResourceStoreManager

    java.lang.Object
      |
      +--org.w3c.tools.resources.store.ResourceStoreManager

public class ResourceStoreManager
extends java.lang.Object
implements ResourceSpace

Field Summary
`protected boolean` | `closed` Is this store shutdown ?
`boolean` | `debugMemory`
`protected ResourceEventQueue` | `eventQueue`
`protected java.io.File` | `index` Our index file.
`protected LRUList` | `lru` The store entries least recetenly used list.
`static java.lang.String` | `root_rep`
`protected java.io.File` | `root_repository` Our root repository.
`protected java.lang.String` | `server_name` server name;
`protected ResourceStoreState` | `state`
`protected java.io.File` | `storedir` Our store directory.
`static int` | `STOREFILE_IDENTIFIER` The identifier for resource store files.
`protected org.w3c.tools.resources.store.StoreManagerSweeper` | `sweeper` Our sweeper thread:

Constructor Summary
`ResourceStoreManager(java.lang.String server_name, java.io.File storedir, java.lang.String default_root_class, java.lang.String default_root_name, int max_loaded_store, java.util.Hashtable defs)` Create a new resource store manager for given store directory.

Method Summary
`void` | `acquireChildren(SpaceEntry sentry)` Acquire the StoreEntry of the space entry.
`void` | `acquireChildren(SpaceEntry sentry, java.io.File repository, boolean transientFlag)` acquire children from an external file.
`ResourceReference` | `addResource(SpaceEntry sentry, Resource resource, java.util.Hashtable defs)` Add this resource to the StoreEntry of the space entry.
`protected void` | `checkClosed()` Check that this resource store manager isn't closed.
`protected void` | `checkMaxLoadedStore()`
`void` | `checkpoint()` Checkpoint all modified resource stores, by saving them to disk.
`void` | `collect()` Collect enough entries to go back into fixed limits.
`java.lang.String` | `createResourceStoreRepository()` Create a resource store repository name.
`protected void` | `decrLoadedStore()`
`void` | `deleteChildren(SpaceEntry sentry)` Delete all the children of resource indentified by its space entry.
`void` | `deleteResource(SpaceEntry sentry, Resource resource)` delete this resource from the StoreEntry (and the repository).
`void` | `displayIndex()`
`java.util.Enumeration` | `enumerateResourceIdentifiers(SpaceEntry sentry)` Enumerate the name (ie identifiers) of the space entry children.
`int` | `getCurrentStoreIdentifier()`
`ResourceEventQueue` | `getEventQueue()`
`protected java.io.File` | `getIndexFile()` Get the index file.
`protected int` | `getMaxLoadedStore()`
`protected java.lang.Integer` | `getRootKey()` Get The root key.
`protected java.io.File` | `getRootRepository()` Get the root repository.
`protected void` | `incrLoadedStore()`
`protected void` | `loadEntriesIndex()` Load the index file.
`ResourceReference` | `loadResource(SpaceEntry sentry, java.lang.String identifier, java.util.Hashtable defs)` Restore the resource whose name is given.
`ResourceReference` | `loadRootResource(java.lang.String identifier, java.util.Hashtable defs)` Restore the resource whose name is given from the root StoreEntry.
`ResourceReference` | `lookupResource(SpaceEntry sentry, java.lang.String identifier)` Lookup this resource.
`void` | `markModified(SpaceEntry sentry, Resource resource)` Mark the given resource as being modified.
`void` | `markUsed(java.lang.Object token)` Mark the given store as having been used recently.
`static void` | `pickleProlog(java.io.DataOutputStream out, ResourceStore store)` Dump a prolog in given stream for that resource store.
`protected org.w3c.tools.resources.store.StoreEntry` | `pickLRUEntry()` Pick the least recently used entry, and remove all links to it.
`void` | `renameResource(SpaceEntry sentry, java.lang.String oldid, java.lang.String newid)` Rename a resource in this resource space.
`void` | `salvage()`
`ResourceStoreState` | `salvageState()` Try to salvage the resource store manager state.
`void` | `saveChildren(SpaceEntry sentry)` Save all the children of the resource indentified by its spaec entry.
`protected void` | `saveEntriesIndex()` Save the index file.
`void` | `saveResource(SpaceEntry sentry, Resource resource)` Save this resource to the StoreEntry of the space entry.
`void` | `shutdown()` Shutdown this resource store manager.
`static void` | `unpickleProlog(java.io.DataInputStream in, ResourceStore store)` Read in the prolog from the given input stream.
`protected boolean` | `used(java.lang.String rep)`
`protected void` | `warning(java.lang.String msg)` Emit the given string as a warning, to whoever it is appropriate.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### STOREFILE_IDENTIFIER

    public static final int STOREFILE_IDENTIFIER

  The identifier for resource store files. All files that are used as resource store, and whose resource store implementation make use of `pickleProlog` will start with a dump of that integer.
  See Also:
    `pickleProlog(java.io.DataOutputStream, org.w3c.tools.resources.store.ResourceStore)`, `unpickleProlog(java.io.DataInputStream, org.w3c.tools.resources.store.ResourceStore)`

### root_rep

    public static final java.lang.String root_rep

### debugMemory

    public boolean debugMemory

### closed

    protected boolean closed

  Is this store shutdown ?

### storedir

    protected java.io.File storedir

  Our store directory.

### index

    protected java.io.File index

  Our index file.

### server_name

    protected java.lang.String server_name

  server name;

### root_repository

    protected java.io.File root_repository

  Our root repository.

### lru

    protected LRUList lru

  The store entries least recetenly used list.

### state

    protected ResourceStoreState state

### sweeper

    protected org.w3c.tools.resources.store.StoreManagerSweeper sweeper

  Our sweeper thread:

### eventQueue

    protected ResourceEventQueue eventQueue

Constructor Detail

### ResourceStoreManager

    public ResourceStoreManager(java.lang.String server_name,
                                java.io.File storedir,
                                java.lang.String default_root_class,
                                java.lang.String default_root_name,
                                int max_loaded_store,
                                java.util.Hashtable defs)

  Create a new resource store manager for given store directory. The resource store manager will manage the collection of stores contained in the directory, and keep track of the stores state.
  Parameters:
    `storedir` - The store directory to manage.

Method Detail

### getEventQueue

    public ResourceEventQueue getEventQueue()

  Specified by:
    getEventQueue in interface ResourceSpace

### getMaxLoadedStore

    protected final int getMaxLoadedStore()

### incrLoadedStore

    protected void incrLoadedStore()

### decrLoadedStore

    protected void decrLoadedStore()

### checkClosed

    protected final void checkClosed()

  Check that this resource store manager isn't closed.
  Throws:
    java.lang.RuntimeException - If the store manager was closed.

### pickLRUEntry

    protected org.w3c.tools.resources.store.StoreEntry pickLRUEntry()

  Pick the least recently used entry, and remove all links to it. After this method as run, the least recently used entry for some store will be returned. The store manager will have discarded all its link to it, and the entry shutdown will have to be performed by the caller.
  Returns:
    An StoreEntry instance, to be cleaned up.

### collect

    public void collect()

  Collect enough entries to go back into fixed limits.

### createResourceStoreRepository

    public java.lang.String createResourceStoreRepository()

  Create a resource store repository name. This method will return a new resource store repository key. When used in conjunction with the `loadResourceStore` method that takes a key as a parameter, this allows to caller to abstract itself from the physical location of the repository.
  Returns:
    A fresh resource store key, guaranteed to be uniq.

### getCurrentStoreIdentifier

    public int getCurrentStoreIdentifier()

### getIndexFile

    protected java.io.File getIndexFile()

  Get the index file.
  Returns:
    A File instance.

### getRootRepository

    protected java.io.File getRootRepository()

  Get the root repository.
  Returns:
    A File instance.

### getRootKey

    protected java.lang.Integer getRootKey()

  Get The root key.
  Returns:
    A String instance

### warning

    protected void warning(java.lang.String msg)

  Emit the given string as a warning, to whoever it is appropriate.
  Parameters:
    `msg` - The warning message.

### saveEntriesIndex

    protected void saveEntriesIndex()

  Save the index file.

### loadEntriesIndex

    protected void loadEntriesIndex()

  Load the index file.

### shutdown

    public void shutdown()

  Shutdown this resource store manager. Go through all entries, and shut them down.
  Specified by:
    shutdown in interface ResourceSpace

### checkpoint

    public void checkpoint()

  Checkpoint all modified resource stores, by saving them to disk.
  Specified by:
    checkpoint in interface ResourceSpace

### markUsed

    public void markUsed(java.lang.Object token)

  Mark the given store as having been used recently.
  Parameters:
    `token` - The token the resource store manager provided you when it initialized the store.

### pickleProlog

    public static void pickleProlog(java.io.DataOutputStream out,
                                    ResourceStore store)
                             throws java.io.IOException

  Dump a prolog in given stream for that resource store. Using the resource store manager prolog in a resource store implementation is optional. However, it is recommended that whenever possible, you use it to get the benefits of the main method of that class.
  Parameters:
    `out` - The output stream to dump the prolog to.
    `store` - The resource store which is being dumped.
  Throws:
    java.io.IOException - If the prolog couldn't be pickled to the given output stream.
  See Also:
    `unpickleProlog(java.io.DataInputStream, org.w3c.tools.resources.store.ResourceStore)`

### unpickleProlog

    public static void unpickleProlog(java.io.DataInputStream in,
                                      ResourceStore store)
                               throws java.io.IOException,
                                      NotAStoreException,
                                      InvalidStoreClassException,
                                      StoreClassVersionException

  Read in the prolog from the given input stream. This method checks the consistency between the implementation of the store that wants to read from that stream, and the implementation of the store that has been used to create it.

  Using that method, as well as using the `pickleProlog` method is optional; however, using one makes using the other mandatory.

  Parameters:
    `in` - The input stream to read the prolog from.
    `store` - The store that is to be created from the given input stream.
  Throws:
    java.io.IOException - If the stream couldn't be read.
    NotAStoreException - If the given repository wasn't flagged as containing a resource store.
    InvalidStoreClassException - If the loading class is not the saving class.
    StoreClassVersionException - If the saved store version number doesn't match the loader's class version number.
  See Also:
    `pickleProlog(java.io.DataOutputStream, org.w3c.tools.resources.store.ResourceStore)`

### used

    protected boolean used(java.lang.String rep)

### salvage

    public void salvage()

### displayIndex

    public void displayIndex()

### salvageState

    public ResourceStoreState salvageState()

  Try to salvage the resource store manager state. That's pretty easy and robust, it should really work well if no one hacked the store directory.
  Returns:
    A ResourceStoreState instance.

### loadRootResource

    public ResourceReference loadRootResource(java.lang.String identifier,
                                              java.util.Hashtable defs)

  Restore the resource whose name is given from the root StoreEntry.
  Specified by:
    loadRootResource in interface ResourceSpace
  Parameters:
    `identifier` - The identifier of the resource to restore.
    `defs` - Default attribute values.

### lookupResource

    public ResourceReference lookupResource(SpaceEntry sentry,
                                            java.lang.String identifier)

  Lookup this resource.
  Specified by:
    lookupResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `identifier` - The resource identifier.
  Returns:
    A Resource instance, or null if either the resource doesn't exist, or it isn't loaded yet.

### loadResource

    public ResourceReference loadResource(SpaceEntry sentry,
                                          java.lang.String identifier,
                                          java.util.Hashtable defs)

  Restore the resource whose name is given.
  Specified by:
    loadResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `identifier` - The identifier of the resource to restore.
    `defs` - Default attribute values.

### addResource

    public ResourceReference addResource(SpaceEntry sentry,
                                         Resource resource,
                                         java.util.Hashtable defs)

  Add this resource to the StoreEntry of the space entry.
  Specified by:
    addResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `resource` - The resource to add.
    `defs` - Default attribute values.

### saveResource

    public void saveResource(SpaceEntry sentry,
                             Resource resource)

  Save this resource to the StoreEntry of the space entry.
  Specified by:
    saveResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry
    `resource` - The resource to save.

### markModified

    public void markModified(SpaceEntry sentry,
                             Resource resource)

  Mark the given resource as being modified.
  Specified by:
    markModified in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `resource` - The resource to mark as modified.

### renameResource

    public void renameResource(SpaceEntry sentry,
                               java.lang.String oldid,
                               java.lang.String newid)

  Rename a resource in this resource space.
  Specified by:
    renameResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `oldid` - The old resorce identifier.
    `newid` - The new resorce identifier.

### deleteResource

    public void deleteResource(SpaceEntry sentry,
                               Resource resource)

  delete this resource from the StoreEntry (and the repository).
  Specified by:
    deleteResource in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry
    `resource` - The resource to delete.

### deleteChildren

    public void deleteChildren(SpaceEntry sentry)

  Delete all the children of resource indentified by its space entry.
  Specified by:
    deleteChildren in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry

### saveChildren

    public void saveChildren(SpaceEntry sentry)

  Save all the children of the resource indentified by its spaec entry.
  Specified by:
    saveChildren in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry

### checkMaxLoadedStore

    protected void checkMaxLoadedStore()

### acquireChildren

    public void acquireChildren(SpaceEntry sentry,
                                java.io.File repository,
                                boolean transientFlag)

  acquire children from an external file.
  Specified by:
    acquireChildren in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.
    `repository` - The file used to store children.

### acquireChildren

    public void acquireChildren(SpaceEntry sentry)

  Acquire the StoreEntry of the space entry.
  Specified by:
    acquireChildren in interface ResourceSpace
  Parameters:
    `sentry` - The resource space entry.

### enumerateResourceIdentifiers

    public java.util.Enumeration enumerateResourceIdentifiers(SpaceEntry sentry)

  Enumerate the name (ie identifiers) of the space entry children.
  Specified by:
    enumerateResourceIdentifiers in interface ResourceSpace
  Parameters:
    `sentry` - The space entry.
    `all` - Should all resources be listed.
  Returns:
    An enumeration, providing one element per child, which is the name of the child, as a String.

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