Class DiskStore


  • public class DiskStore
    extends java.lang.Object
    Singleton class used to store and retrieve files to / from a temporary disk storage.
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static DiskStore instance
      Shared instance.
      private java.util.Map<java.lang.String,​java.io.File> map
      Map used to store references to temprorary files.
      static java.lang.String ROOT_PATH  
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private DiskStore()
      Private constructor.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.io.File addFile​(java.lang.String key)
      Add a file to the store.
      java.lang.String generateUniqueKey()
      Generates a unique diskstore key.
      java.io.File getFile​(java.lang.String key)
      Retrieve a File from a store key.
      static DiskStore getInstance()
      Access to the shared instance.
      void removeFile​(java.lang.String key)
      Remove a file from the store.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • ROOT_PATH

        public static final java.lang.String ROOT_PATH
      • instance

        private static DiskStore instance
        Shared instance.
      • map

        private final java.util.Map<java.lang.String,​java.io.File> map
        Map used to store references to temprorary files.
    • Constructor Detail

      • DiskStore

        private DiskStore()
        Private constructor.
    • Method Detail

      • getInstance

        public static DiskStore getInstance()
        Access to the shared instance.
        Returns:
        The shared DiskStore instance.
      • generateUniqueKey

        public java.lang.String generateUniqueKey()
        Generates a unique diskstore key. Use the JVM PID and UUID.
        Returns:
        A unique key as string
      • getFile

        public java.io.File getFile​(java.lang.String key)
        Retrieve a File from a store key. If key is unknown, null is returned.
        Parameters:
        key - Unique file resource identifier.
        Returns:
        File or null (if not found).
      • removeFile

        public void removeFile​(java.lang.String key)
                        throws java.io.IOException
        Remove a file from the store. This also deleted the temporary file from the file system.
        Parameters:
        key - Unique file resource identifier.
        Throws:
        java.io.IOException - In case the file cannot be deleted.
      • addFile

        public java.io.File addFile​(java.lang.String key)
        Add a file to the store.
        Parameters:
        key - File unique identifier.
        Returns:
        The generated (empty) file.