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Interface IBlobManagementOptions

  • All Known Implementing Classes:
    BlobManagementOptions

    public interface IBlobManagementOptions

    A Binary Large Object (BLOB) is a binary data stored as a single entity - i.e. BLOB can be an audio, video or presentation itself. A number of techniques are used to optimize memory consumption while working with BLOBs - which was already stored in the presentation or be added later programmatically. Using IBlobManagementOptions you can change a different behavior aspects regarding BLOBs handling for the IPresentation instance lifetime.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method and Description
      long getMaxBlobsBytesInMemory()
      Defines the maximum amount (in bytes) that all BLOBs in total may occupy in memory.
      int getPresentationLockingBehavior()
      This property defines if an instance of the Presentation class can be an owner of the source - file or stream during the instance lifetime.
      java.lang.String getTempFilesRootPath()
      The root path where temporary files will be created.
      boolean isTemporaryFilesAllowed()
      This property defines if temporary files can be created while working with BLOBs, what greatly decreases the memory consumption but requires permissions to create files.
      void setMaxBlobsBytesInMemory(long value)
      Defines the maximum amount (in bytes) that all BLOBs in total may occupy in memory.
      void setPresentationLockingBehavior(int value)
      This property defines if an instance of the Presentation class can be an owner of the source - file or stream during the instance lifetime.
      void setTempFilesRootPath(java.lang.String value)
      The root path where temporary files will be created.
      void setTemporaryFilesAllowed(boolean value)
      This property defines if temporary files can be created while working with BLOBs, what greatly decreases the memory consumption but requires permissions to create files.

    • Method Detail

      • getPresentationLockingBehavior

        int getPresentationLockingBehavior()

        This property defines if an instance of the Presentation class can be an owner of the source - file or stream during the instance lifetime. If the instance is an owner, it locks the source. This helps to improve memory consumption and performance while working with BLOBs, but the source (stream or file) can't be changed during Presentation's instance lifetime. This is an example: 

         
         LoadOptions loadOptions = new LoadOptions();
 loadOptions.getBlobManagementOptions().setPresentationLockingBehavior(PresentationLockingBehavior.KeepLocked);
 Presentation pres = new Presentation("pres.pptx", loadOptions);
 // IOException will be thrown because pres.pptx is locked for a Presentation lifetime
 // java.io.File f = new java.io.File("pres.pptx");
 // f.delete();
 // after Presentation object disposed, file is unlocked and can be deleted
 java.io.File f = new java.io.File("pres.pptx");
 f.delete();

      • setPresentationLockingBehavior

        void setPresentationLockingBehavior(int value)

        This property defines if an instance of the Presentation class can be an owner of the source - file or stream during the instance lifetime. If the instance is an owner, it locks the source. This helps to improve memory consumption and performance while working with BLOBs, but the source (stream or file) can't be changed during Presentation's instance lifetime. This is an example: 

         
         LoadOptions loadOptions = new LoadOptions();
 loadOptions.getBlobManagementOptions().setPresentationLockingBehavior(PresentationLockingBehavior.KeepLocked);
 Presentation pres = new Presentation("pres.pptx", loadOptions);
 // IOException will be thrown because pres.pptx is locked for a Presentation lifetime
 // java.io.File f = new java.io.File("pres.pptx");
 // f.delete();
 // after Presentation object disposed, file is unlocked and can be deleted
 java.io.File f = new java.io.File("pres.pptx");
 f.delete();

      • isTemporaryFilesAllowed

        boolean isTemporaryFilesAllowed()

        This property defines if temporary files can be created while working with BLOBs, what greatly decreases the memory consumption but requires permissions to create files.

        All files will be deleted after work with the presentation will be finished.

      • setTemporaryFilesAllowed

        void setTemporaryFilesAllowed(boolean value)

        This property defines if temporary files can be created while working with BLOBs, what greatly decreases the memory consumption but requires permissions to create files.

        All files will be deleted after work with the presentation will be finished.

      • getTempFilesRootPath

        java.lang.String getTempFilesRootPath()

        The root path where temporary files will be created. Hosting process should have permissions to create files and folders there.

      • setTempFilesRootPath

        void setTempFilesRootPath(java.lang.String value)

        The root path where temporary files will be created. Hosting process should have permissions to create files and folders there.

      • getMaxBlobsBytesInMemory

        long getMaxBlobsBytesInMemory()

        Defines the maximum amount (in bytes) that all BLOBs in total may occupy in memory. First, all BLOBs loading into memory as default behavior and only when it reaches the limit defined by this property, other mechanisms (such as temporary files) can be involved. In terms of performance, the most efficient way is storing BLOBs in memory, but from the other side, it leads to a high memory consumption what may be undesirable. Using this property, you may set the optimal behavior for your environment or other requirements.

        This property will be ignored if IsTemporaryFilesAllowed(isTemporaryFilesAllowed()/setTemporaryFilesAllowed(boolean)) is set to false. It makes no sense to limit the maximum BLOBs in memory, because if IsTemporaryFilesAllowed(isTemporaryFilesAllowed()/setTemporaryFilesAllowed(boolean)) is set to false, the memory is the only place where BLOBs can be stored.

        Default value is 629,145,600 bytes (600Mb).

      • setMaxBlobsBytesInMemory

        void setMaxBlobsBytesInMemory(long value)

        Defines the maximum amount (in bytes) that all BLOBs in total may occupy in memory. First, all BLOBs loading into memory as default behavior and only when it reaches the limit defined by this property, other mechanisms (such as temporary files) can be involved. In terms of performance, the most efficient way is storing BLOBs in memory, but from the other side, it leads to a high memory consumption what may be undesirable. Using this property, you may set the optimal behavior for your environment or other requirements.

        This property will be ignored if IsTemporaryFilesAllowed(isTemporaryFilesAllowed()/setTemporaryFilesAllowed(boolean)) is set to false. It makes no sense to limit the maximum BLOBs in memory, because if IsTemporaryFilesAllowed(isTemporaryFilesAllowed()/setTemporaryFilesAllowed(boolean)) is set to false, the memory is the only place where BLOBs can be stored.

        Default value is 629,145,600 bytes (600Mb).