1 files changed, 93 insertions, 0 deletions
diff --git a/TAO/tao/Storable_File_Guard.h b/TAO/tao/Storable_File_Guard.h
new file mode 100644
index 00000000000..b062f9a8ad9
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+++ b/TAO/tao/Storable_File_Guard.h
@@ -0,0 +1,93 @@
+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file   Storable_File_Guard.h
+ *
+ *  $Id$
+ *
+ *  @author Rich Seibel (seibelr@ociweb.com)
+ *  @author Byron Harris (harrisb@ociweb.com)
+ */
+//=============================================================================
+
+#ifndef TAO_STORABLE_FILE_GUARD_H
+#define TAO_STORABLE_FILE_GUARD_H
+
+#include "tao/orbconf.h"
+#include "tao/TAO_Export.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+namespace TAO
+{
+
+  class Storable_Base;
+
+  /**
+   * @class Storable_File_Guard
+   * @brief Bridge abstract class for TAO_Storable_Base that performs locking.
+   *
+   * A guard for Storable_Base that opens a file
+   * for read/write and sets a lock on it. It then checks if the file has
+   * changed and re-reads it if it has.
+   *
+   * The destructor releases the lock.
+   */
+  class TAO_Export Storable_File_Guard
+  {
+  public:
+
+    Storable_File_Guard (bool redundant);
+
+    virtual ~Storable_File_Guard ();
+
+    /// Releases the lock, closes the file, and deletes the I/O stream.
+    void release (void);
+
+    /// Returns the stream to read/write on
+    Storable_Base & peer (void);
+
+  protected:
+
+    /// Should be called by constructors of derived classes
+    /// since can't call virtual functions below in constructor
+    /// of this class.
+    void init (const char * mode);
+
+    virtual void set_parent_last_changed (const time_t & time) = 0;
+
+    virtual time_t get_parent_last_changed () = 0;
+
+    virtual void create_child () = 0;
+
+    virtual bool is_child_created () = 0;
+
+    virtual Storable_Base * create_stream (const char * mode) = 0;
+
+    /// The pointer to the actual file I/O (bridge pattern)
+    Storable_Base *fl_;
+
+  private:
+
+    bool redundant_;
+
+    /// Default constructor
+    Storable_File_Guard ();
+
+    /// A flag to keep us from trying to close things more than once.
+    int closed_;
+
+    /// The flags that we were opened with
+    int rwflags_;
+
+    /// Symbolic values for the flags in the above
+    enum { mode_write = 1, mode_read = 2, mode_create = 4 };
+
+  };
+
+}
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#endif