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Raft: Basic log methods

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This commit is contained in:
Pavel Kirienko
2015-05-03 12:34:45 +03:00
parent a60d5c812a
commit 5633cb8bdb
3 changed files with 175 additions and 37 deletions
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libuavcan/include/uavcan/protocol/dynamic_node_id_allocation_server.hpp
+20 -13
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@@ -31,7 +31,7 @@ namespace uavcan
* The storage is represented as a key-value container, where keys and values are ASCII strings up to 32
* characters long, not including the termination byte. Fixed block size allows for absolutely straightforward
* and efficient implementation of storage backends, e.g. based on text files.
* Keys and values may contain only alphanumeric characters and underscores.
* Keys and values may contain only non-whitespace, non-formatting printable characters.
*/
class IDynamicNodeIDStorageBackend
{
@@ -104,9 +104,9 @@ public:
* 3. Call get() with the same value argument.
* The caller then is supposed to check whether the argument has the desired value.
*/
bool setAndGetBack(const IDynamicNodeIDStorageBackend::String& key, uint32_t& inout_value);
bool setAndGetBack(const IDynamicNodeIDStorageBackend::String& key,
protocol::dynamic_node_id::server::Entry::FieldTypes::unique_id& inout_value);
int setAndGetBack(const IDynamicNodeIDStorageBackend::String& key, uint32_t& inout_value);
int setAndGetBack(const IDynamicNodeIDStorageBackend::String& key,
protocol::dynamic_node_id::server::Entry::FieldTypes::unique_id& inout_value);
/**
* Getters simply read and deserialize the value.
@@ -115,9 +115,9 @@ public:
* 3. Update the argument with deserialized value.
* 4. Return true.
*/
bool get(const IDynamicNodeIDStorageBackend::String& key, uint32_t& out_value) const;
bool get(const IDynamicNodeIDStorageBackend::String& key,
protocol::dynamic_node_id::server::Entry::FieldTypes::unique_id& out_value) const;
int get(const IDynamicNodeIDStorageBackend::String& key, uint32_t& out_value) const;
int get(const IDynamicNodeIDStorageBackend::String& key,
protocol::dynamic_node_id::server::Entry::FieldTypes::unique_id& out_value) const;
};
/**
@@ -135,12 +135,17 @@ private:
IDynamicNodeIDStorageBackend& storage_;
protocol::dynamic_node_id::server::Entry entries_[Capacity];
Index max_index_; // Index zero always contains an empty entry
Index last_index_; // Index zero always contains an empty entry
static IDynamicNodeIDStorageBackend::String makeEntryKey(Index index, const char* postfix);
int readEntryFromStorage(Index index, protocol::dynamic_node_id::server::Entry& out_entry);
int writeEntryToStorage(Index index, const protocol::dynamic_node_id::server::Entry& entry);
public:
Log(IDynamicNodeIDStorageBackend& storage)
: storage_(storage)
, max_index_(0)
, last_index_(0)
{ }
/**
@@ -150,13 +155,15 @@ public:
/**
* This method invokes storage IO.
* Returned value indicates whether the entry was successfully appended.
*/
void append(const protocol::dynamic_node_id::server::Entry& entry);
int append(const protocol::dynamic_node_id::server::Entry& entry);
/**
* This method invokes storage IO.
* Returned value indicates whether the requested operation has been carried out successfully.
*/
void removeEntriesWhereIndexGreaterOrEqual(Index index);
int removeEntriesWhereIndexGreaterOrEqual(Index index);
/**
* Returns nullptr if there's no such index.
@@ -164,7 +171,7 @@ public:
*/
const protocol::dynamic_node_id::server::Entry* getEntryAtIndex(Index index) const;
Index getMaxIndex() const { return max_index_; }
Index getLastIndex() const { return last_index_; }
bool isOtherLogUpToDate(Index other_last_index, Term other_last_term) const;
};
@@ -412,7 +419,7 @@ public:
inline LazyConstructor<LogEntryInfo> traverseLogFromEndUntil(const Predicate& predicate) const
{
UAVCAN_ASSERT(try_implicit_cast<bool>(predicate, true));
for (int index = static_cast<int>(persistent_state_.getLog().getMaxIndex()); index--; index >= 0)
for (int index = static_cast<int>(persistent_state_.getLog().getLastIndex()); index--; index >= 0)
{
const protocol::dynamic_node_id::server::Entry* const entry =
persistent_state_.getLog().getEntryAtIndex(Log::Index(index));