storage : Allow to write inside a file without reducing its final size (for parallel IO)

[simgrid.git] / include / simgrid / plugins / file_system.h

diff --git a/include/simgrid/plugins/file_system.h b/include/simgrid/plugins/file_system.h
index 429d1a6..961331e 100644 (file)
--- a/include/simgrid/plugins/file_system.h
+++ b/include/simgrid/plugins/file_system.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2017-2018. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2017-2019. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -73,6 +73,7 @@ SG_END_DECL()
 #include <xbt/Extendable.hpp>
 
 #include <map>
+#include <memory>
 #include <string>
 
 namespace simgrid {
@@ -88,23 +89,25 @@ namespace s4u {
  */
 class XBT_PUBLIC File {
 public:
-  File(std::string fullpath, void* userdata);
-  File(std::string fullpath, sg_host_t host, void* userdata);
+  File(const std::string& fullpath, void* userdata);
+  File(const std::string& fullpath, sg_host_t host, void* userdata);
+  File(const File&) = delete;
+  File& operator=(const File&) = delete;
   ~File();
 
   /** Retrieves the path to the file */
-  const char* getPath() { return fullpath_.c_str(); }
+  const char* get_path() { return fullpath_.c_str(); }
 
   /** Simulates a local read action. Returns the size of data actually read */
   sg_size_t read(sg_size_t size);
 
   /** Simulates a write action. Returns the size of data actually written. */
-  sg_size_t write(sg_size_t size);
+  sg_size_t write(sg_size_t size, int write_inside=0);
 
   /** Allows to store user data on that host */
-  void setUserdata(void* data) { userdata_ = data; }
+  void set_userdata(void* data) { userdata_ = data; }
   /** Retrieves the previously stored data */
-  void* getUserdata() { return userdata_; }
+  void* get_userdata() { return userdata_; }
 
   sg_size_t size();
   void seek(sg_offset_t pos);             /** Sets the file head to the given position. */
@@ -112,15 +115,15 @@ public:
   sg_size_t tell();                       /** Retrieves the current file position */
 
   /** Rename a file. WARNING: It is forbidden to move the file to another mount point */
-  void move(std::string fullpath);
-  int remoteCopy(sg_host_t host, const char* fullpath);
-  int remoteMove(sg_host_t host, const char* fullpath);
+  void move(const std::string& fullpath);
+  int remote_copy(sg_host_t host, const char* fullpath);
+  int remote_move(sg_host_t host, const char* fullpath);
 
   int unlink(); /** Remove a file from the contents of a disk */
   void dump();
 
   int desc_id = 0;
-  Storage* localStorage;
+  Storage* local_storage_;
   std::string mount_point_;
 
 private:
@@ -135,17 +138,18 @@ class XBT_PUBLIC FileSystemStorageExt {
 public:
   static simgrid::xbt::Extension<Storage, FileSystemStorageExt> EXTENSION_ID;
   explicit FileSystemStorageExt(Storage* ptr);
-  ~FileSystemStorageExt();
-  std::map<std::string, sg_size_t>* parseContent(std::string filename);
-  std::map<std::string, sg_size_t>* getContent() { return content_; }
-  sg_size_t getSize() { return size_; }
-  sg_size_t getUsedSize() { return usedSize_; }
-  void decrUsedSize(sg_size_t size) { usedSize_ -= size; }
-  void incrUsedSize(sg_size_t size) { usedSize_ += size; }
+  FileSystemStorageExt(const FileSystemStorageExt&) = delete;
+  FileSystemStorageExt& operator=(const FileSystemStorageExt&) = delete;
+  std::map<std::string, sg_size_t>* parse_content(const std::string& filename);
+  std::map<std::string, sg_size_t>* get_content() { return content_.get(); }
+  sg_size_t get_size() { return size_; }
+  sg_size_t get_used_size() { return used_size_; }
+  void decr_used_size(sg_size_t size) { used_size_ -= size; }
+  void incr_used_size(sg_size_t size) { used_size_ += size; }
 
 private:
-  std::map<std::string, sg_size_t>* content_;
-  sg_size_t usedSize_ = 0;
+  std::unique_ptr<std::map<std::string, sg_size_t>> content_;
+  sg_size_t used_size_ = 0;
   sg_size_t size_     = 0;
 };
 
@@ -153,8 +157,9 @@ class XBT_PUBLIC FileDescriptorHostExt {
 public:
   static simgrid::xbt::Extension<Host, FileDescriptorHostExt> EXTENSION_ID;
   FileDescriptorHostExt() = default;
-  ~FileDescriptorHostExt() { delete file_descriptor_table; }
-  std::vector<int>* file_descriptor_table = nullptr; // Created lazily on need
+  FileDescriptorHostExt(const FileDescriptorHostExt&) = delete;
+  FileDescriptorHostExt& operator=(const FileDescriptorHostExt&) = delete;
+  std::unique_ptr<std::vector<int>> file_descriptor_table        = nullptr; // Created lazily on need
 };
 } // namespace s4u
 } // namespace simgrid