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authorReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
committerReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
commit3e924126b56c4d421e8263d25f6b14aa4ceed047 (patch)
tree921403de7b834fb1ac89f97d84ce105e0b487051 /nxcomp/Split.h
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of NoMachine S.r.l. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#ifndef Split_H
+#define Split_H
+
+#include "Types.h"
+#include "Timestamp.h"
+#include "Message.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+//
+// Define this to know how many splits
+// are allocated and deallocated.
+//
+
+#undef REFERENCES
+
+//
+// Size of header of messages saved on
+// disk.
+//
+
+#define SPLIT_HEADER_SIZE 12
+
+//
+// This class is used to divide big messages
+// in smaller chunks and send them at idle
+// time.
+//
+
+class EncodeBuffer;
+class DecodeBuffer;
+
+class SplitStore;
+class CommitStore;
+
+//
+// Preferred message streaming policy.
+//
+
+typedef enum
+{
+ split_none = -1,
+ split_async = 1,
+ split_sync
+
+} T_split_mode;
+
+//
+// Current state of the split. Used to
+// implement the state machine.
+//
+
+typedef enum
+{
+ split_undefined = -1,
+ split_added,
+ split_missed,
+ split_loaded,
+ split_aborted,
+ split_notified
+
+} T_split_state;
+
+class Split
+{
+ friend class SplitStore;
+ friend class CommitStore;
+
+ public:
+
+ Split();
+
+ ~Split();
+
+ //
+ // Note that, differently from the message
+ // store, the split store doesn't account
+ // for the data offset when dealing with
+ // the data. This means that both the size_
+ // and c_size members represent the actual
+ // size of the data part.
+ //
+
+ void compressedSize(int size)
+ {
+ c_size_ = size;
+
+ store_ -> validateSize(d_size_, c_size_);
+ }
+
+ int compressedSize()
+ {
+ return c_size_;
+ }
+
+ int plainSize()
+ {
+ return i_size_ + d_size_;
+ }
+
+ T_checksum getChecksum()
+ {
+ return checksum_;
+ }
+
+ MessageStore *getStore()
+ {
+ return store_;
+ }
+
+ T_split_state getState()
+ {
+ return state_;
+ }
+
+ T_store_action getAction()
+ {
+ return action_;
+ }
+
+ //
+ // We may need to find the resource
+ // associated to the split message
+ // because old protocol version use
+ // a single store for all splits.
+ //
+
+ int getResource()
+ {
+ return resource_;
+ }
+
+ int getRequest()
+ {
+ return store_ -> opcode();
+ }
+
+ int getPosition()
+ {
+ return position_;
+ }
+
+ T_split_mode getMode()
+ {
+ return mode_;
+ }
+
+ void setPolicy(int load, int save)
+ {
+ load_ = load;
+ save_ = save;
+ }
+
+ void setState(T_split_state state)
+ {
+ state_ = state;
+ }
+
+ private:
+
+ //
+ // The agent's resource which is splitting
+ // the message.
+ //
+
+ int resource_;
+
+ //
+ // Where to find the message in the message
+ // store or the X sequence number of the
+ // original request, in recent versions.
+ //
+
+ int position_;
+
+ //
+ // Which store is involved.
+ //
+
+ MessageStore *store_;
+
+ //
+ // Identity size of the message.
+ //
+
+ int i_size_;
+
+ //
+ // This is the uncompressed data size of the
+ // original message.
+ //
+
+ int d_size_;
+
+ //
+ // This is the size of the compressed data,
+ // if the data is stored in this form.
+ //
+
+ int c_size_;
+
+ //
+ // Size of the data buffer, as known by the
+ // encoding side. This field is only used at
+ // the decoding side. The remote size can be
+ // different from the actual data size, if
+ // the encoding side did not confirm that it
+ // received the abort split event.
+ //
+
+ int r_size_;
+
+ //
+ // Position in the data buffer that will be
+ // the target of the next send or receive
+ // operation while streaming the message.
+ //
+
+ int next_;
+
+ //
+ // Load or save the split to disk.
+ //
+
+ int load_;
+ int save_;
+
+ //
+ // Checksum of the original message.
+ //
+
+ T_checksum checksum_;
+
+ //
+ // Was this split confirmed or aborted?
+ //
+
+ T_split_state state_;
+
+ //
+ // What's the policy for sending this split?
+ //
+
+ T_split_mode mode_;
+
+ //
+ // Operation that had been performed on the
+ // store at the time the split was added.
+ //
+
+ T_store_action action_;
+
+ //
+ // Container for the identity and data part
+ // of the X message.
+ //
+
+ T_data identity_;
+ T_data data_;
+
+ #ifdef REFERENCES
+
+ static int references_;
+
+ #endif
+};
+
+class SplitStore
+{
+ public:
+
+ SplitStore(StaticCompressor *compressor, CommitStore *commits, int resource);
+
+ ~SplitStore();
+
+ Split *getFirstSplit() const
+ {
+ if (splits_ -> size() > 0)
+ {
+ return (*(splits_ -> begin()));
+ }
+
+ return NULL;
+ }
+
+ Split *getLastSplit() const
+ {
+ if (splits_ -> size() > 0)
+ {
+ return (*(--(splits_ -> end())));
+ }
+
+ return NULL;
+ }
+
+ int getNodeSize(const Split *split) const
+ {
+ //
+ // Take in account 64 bytes of overhead
+ // for each node.
+ //
+
+ return (sizeof(class Split) + 64 +
+ split -> i_size_ + split -> d_size_);
+ }
+
+ int getStorageSize()
+ {
+ return splitStorageSize_;
+ }
+
+ static int getTotalSize()
+ {
+ return totalSplitSize_;
+ }
+
+ static int getTotalStorageSize()
+ {
+ return totalSplitStorageSize_;
+ }
+
+ int getResource()
+ {
+ return resource_;
+ }
+
+ int getSize()
+ {
+ return splits_ -> size();
+ }
+
+ T_splits *getSplits()
+ {
+ return splits_;
+ }
+
+ //
+ // Used, respectively, at the encoding
+ // and decoding side.
+ //
+
+ Split *add(MessageStore *store, int resource, T_split_mode mode,
+ int position, T_store_action action, T_checksum checksum,
+ const unsigned char *buffer, const int size);
+
+ Split *add(MessageStore *store, int resource, int position,
+ T_store_action action, T_checksum checksum,
+ unsigned char *buffer, const int size);
+
+ //
+ // Handle the streaming of the message data.
+ //
+
+ int send(EncodeBuffer &encodeBuffer, int packetSize);
+
+ int receive(DecodeBuffer &decodeBuffer);
+
+ //
+ // Remove the top element of the split store
+ // and update the storage size.
+ //
+
+ void remove(Split *split);
+
+ //
+ // Load the message from disk and replace the
+ // message in the store with the new copy.
+ //
+
+ int load(Split *split);
+
+ //
+ // Save the data to disk after the message has
+ // been recomposed at the local side.
+ //
+
+ int save(Split *split);
+
+ //
+ // Find the message on disk and update the last
+ // modification time. This is currently unused.
+ //
+
+ int find(Split *split);
+
+ //
+ // Remove the element on top of the queue and
+ // discard any split data that still needs to
+ // be transferred.
+ //
+
+ Split *pop();
+
+ //
+ // Dump the content of the store.
+ //
+
+ void dump();
+
+ protected:
+
+ //
+ // Repository where to add the splits.
+ //
+
+ T_splits *splits_;
+
+ //
+ // Compress and decompress the data payload.
+ //
+
+ StaticCompressor *compressor_;
+
+ private:
+
+ int start(EncodeBuffer &encodeBuffer);
+
+ int start(DecodeBuffer &decodeBuffer);
+
+ void push(Split *split);
+
+ //
+ // Determine the name of the file object based
+ // on the checksum.
+ //
+
+ const char *name(const T_checksum checksum);
+
+ //
+ // The number of elements and data bytes
+ // in the repository.
+ //
+
+ int splitStorageSize_;
+
+ static int totalSplitSize_;
+ static int totalSplitStorageSize_;
+
+ //
+ // Current element being transferred.
+ //
+
+ T_splits::iterator current_;
+
+ //
+ // Repository where to move the splits
+ // after they are completely recomposed.
+ //
+
+ CommitStore *commits_;
+
+ //
+ // Index in the client store or none,
+ // if this is a commit store.
+ //
+
+ int resource_;
+
+ #ifdef REFERENCES
+
+ static int references_;
+
+ #endif
+};
+
+class CommitStore : public SplitStore
+{
+ //
+ // This is just a split store.
+ //
+
+ public:
+
+ CommitStore(StaticCompressor *compressor)
+
+ : SplitStore(compressor, NULL, nothing)
+ {
+ }
+
+ //
+ // Move identity and data of the split to the
+ // provided buffer, uncompressing the message,
+ // if needed.
+ //
+
+ int expand(Split *split, unsigned char *buffer, const int size);
+
+ //
+ // We recomposed the data part. If the message
+ // was originally added to the message store,
+ // replace the data and/or update the size.
+ //
+
+ int update(Split *split);
+
+ //
+ // Remove the split from the commit queue.
+ //
+
+ Split *pop();
+
+ //
+ // This is just used for debug. It checks
+ // if any message in the message store has
+ // an invalid number of locks.
+ //
+
+ int validate(Split *split);
+};
+
+#endif /* Split_H */