summaryrefslogtreecommitdiffstats
path: root/wsrep-lib/include/wsrep/streaming_context.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'wsrep-lib/include/wsrep/streaming_context.hpp')
-rw-r--r--wsrep-lib/include/wsrep/streaming_context.hpp180
1 files changed, 180 insertions, 0 deletions
diff --git a/wsrep-lib/include/wsrep/streaming_context.hpp b/wsrep-lib/include/wsrep/streaming_context.hpp
new file mode 100644
index 00000000..2b0ef0f3
--- /dev/null
+++ b/wsrep-lib/include/wsrep/streaming_context.hpp
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_STREAMING_CONTEXT_HPP
+#define WSREP_STREAMING_CONTEXT_HPP
+
+#include "compiler.hpp"
+#include "logger.hpp"
+#include "seqno.hpp"
+#include "transaction_id.hpp"
+
+#include <vector>
+
+namespace wsrep
+{
+ /* Helper class to store streaming transaction context. */
+ class streaming_context
+ {
+ public:
+ enum fragment_unit
+ {
+ bytes,
+ row,
+ statement
+ };
+
+ streaming_context()
+ : fragments_certified_()
+ , fragments_()
+ , rollback_replicated_for_()
+ , fragment_unit_()
+ , fragment_size_()
+ , unit_counter_()
+ , log_position_()
+ { }
+
+ /**
+ * Set streaming parameters.
+ *
+ * Calling this method has a side effect of resetting unit
+ * counter.
+ *
+ * @param fragment_unit Desired fragment unit.
+ * @param fragment_size Desired fragment size.
+ */
+ void params(enum fragment_unit fragment_unit, size_t fragment_size);
+
+ /**
+ * Enable streaming replication.
+ *
+ * @param fragment_unit Desired fragment unit.
+ * @param fragment_size Desired fragment size.
+ */
+ void enable(enum fragment_unit fragment_unit, size_t fragment_size);
+
+ /** Return current fragment unit. */
+ enum fragment_unit fragment_unit() const { return fragment_unit_; }
+
+ /** Return current fragment size. */
+ size_t fragment_size() const { return fragment_size_; }
+
+ /** Disable streaming replication. */
+ void disable();
+
+ /** Increment counter for certified fragments. */
+ void certified()
+ {
+ ++fragments_certified_;
+ }
+
+ /** Return number of certified fragments. */
+ size_t fragments_certified() const
+ {
+ return fragments_certified_;
+ }
+
+ /** Mark fragment with seqno as stored in fragment store. */
+ void stored(wsrep::seqno seqno);
+
+ /** Return number of stored fragments. */
+ size_t fragments_stored() const
+ {
+ return fragments_.size();
+ }
+
+ /** Mark fragment with seqno as applied. */
+ void applied(wsrep::seqno seqno);
+
+ /** Mark streaming transaction as rolled back. */
+ void rolled_back(wsrep::transaction_id id);
+
+ /** Return true if streaming transaction has been marked
+ * as rolled back. */
+ bool rolled_back() const
+ {
+ return (rollback_replicated_for_ !=
+ wsrep::transaction_id::undefined());
+ }
+
+ /** Return current value of unit counter. */
+ size_t unit_counter() const
+ {
+ return unit_counter_;
+ }
+
+ /** Set value for unit counter. */
+ void set_unit_counter(size_t count)
+ {
+ unit_counter_ = count;
+ }
+
+ /** Increment unit counter by inc. */
+ void increment_unit_counter(size_t inc)
+ {
+ unit_counter_ += inc;
+ }
+
+ /** Reset unit counter to zero. */
+ void reset_unit_counter()
+ {
+ unit_counter_ = 0;
+ }
+
+ /** Return current log position. */
+ size_t log_position() const
+ {
+ return log_position_;
+ }
+
+ /** Set log position. */
+ void set_log_position(size_t position)
+ {
+ log_position_ = position;
+ }
+
+ /** Return vector of stored fragments. */
+ const std::vector<wsrep::seqno>& fragments() const
+ {
+ return fragments_;
+ }
+
+ /** Return true if the fragment size was exceeded. */
+ bool fragment_size_exceeded() const
+ {
+ return unit_counter_ >= fragment_size_;
+ }
+
+ /** Clean up the streaming transaction state. */
+ void cleanup();
+ private:
+
+ void check_fragment_seqno(wsrep::seqno seqno);
+
+ size_t fragments_certified_;
+ std::vector<wsrep::seqno> fragments_;
+ wsrep::transaction_id rollback_replicated_for_;
+ enum fragment_unit fragment_unit_;
+ size_t fragment_size_;
+ size_t unit_counter_;
+ size_t log_position_;
+ };
+}
+
+#endif // WSREP_STREAMING_CONTEXT_HPP