FragmentManager.h

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00038 #ifndef __FRAGMENT_MANAGER_H__
00039 #define __FRAGMENT_MANAGER_H__
00040 
00041 #include <string>
00042 #include <oasys/debug/Log.h>
00043 #include <oasys/util/StringUtils.h>
00044 
00045 namespace oasys {
00046 class SpinLock;
00047 }
00048 
00049 namespace dtn {
00050 
00051 class Bundle;
00052 class BundleList;
00053 
00054 // XXX/demmer should change the overall flow of the reassembly so all
00055 // arriving bundle fragments are enqueued onto the appropriate
00056 // reassembly state list immediately -- in fact all the fragmentation
00057 // and reassembly stuff needs rework
00058 
00066 class FragmentManager : public oasys::Logger {
00067 public:
00071     FragmentManager();
00072     
00092     Bundle* create_fragment(Bundle* bundle, size_t offset, size_t length);
00093 
00100     void convert_to_fragment(Bundle* bundle, size_t length);
00101 
00111     int proactively_fragment(Bundle* bundle, size_t max_length);
00112 
00119     bool try_to_reactively_fragment(Bundle* bundle, size_t bytes_sent);
00120 
00127     void process_for_reassembly(Bundle* fragment);
00128 
00129  protected:
00131     struct ReassemblyState {
00132         ReassemblyState()
00133             : bundle_("reassembly_state"), fragments_("reassembly_state")
00134         {}
00135         
00136         BundleRef  bundle_;     
00137         BundleList fragments_;  
00138     };
00139     
00143     void get_hash_key(const Bundle*, std::string* key);
00144 
00148     bool check_completed(ReassemblyState* state);
00149 
00151     typedef oasys::StringHashMap<ReassemblyState*> ReassemblyTable;
00152     ReassemblyTable reassembly_table_;
00153 };
00154 
00155 } // namespace dtn
00156 
00157 #endif /* __FRAGMENT_MANAGER_H__ */

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