X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Ftest%2FObjectMap%2FKeyValueDBMemory.cc;fp=src%2Fceph%2Fsrc%2Ftest%2FObjectMap%2FKeyValueDBMemory.cc;h=1a095e3e1a149f7bd37105ab9280ee2d787d723c;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/test/ObjectMap/KeyValueDBMemory.cc b/src/ceph/src/test/ObjectMap/KeyValueDBMemory.cc
new file mode 100644
index 0000000..1a095e3
--- /dev/null
+++ b/src/ceph/src/test/ObjectMap/KeyValueDBMemory.cc
@@ -0,0 +1,265 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#include "include/encoding.h"
+#include "KeyValueDBMemory.h"
+#include <map>
+#include <set>
+#include "include/memory.h"
+#include <iostream>
+
+using namespace std;
+
+/**
+ * Iterate over the whole key space of the in-memory store
+ *
+ * @note Removing keys from the store while iterating over the store key-space
+ *	 may result in unspecified behavior.
+ *	 If one wants to safely iterate over the store while updating the
+ *	 store, one should instead use a snapshot iterator, which provides
+ *	 strong read-consistency.
+ */
+class WholeSpaceMemIterator : public KeyValueDB::WholeSpaceIteratorImpl {
+protected:
+  KeyValueDBMemory *db;
+  bool ready;
+
+  map<pair<string,string>, bufferlist>::iterator it;
+
+public:
+  explicit WholeSpaceMemIterator(KeyValueDBMemory *db) : db(db), ready(false) { }
+  ~WholeSpaceMemIterator() override { }
+
+  int seek_to_first() override {
+    if (db->db.empty()) {
+      it = db->db.end();
+      ready = false;
+      return 0;
+    }
+    it = db->db.begin();
+    ready = true;
+    return 0;
+  }
+
+  int seek_to_first(const string &prefix) override {
+    it = db->db.lower_bound(make_pair(prefix, ""));
+    if (db->db.empty() || (it == db->db.end())) {
+      it = db->db.end();
+      ready = false;
+      return 0;
+    }
+    ready = true;
+    return 0;
+  }
+
+  int seek_to_last() override {
+    it = db->db.end();
+    if (db->db.empty()) {
+      ready = false;
+      return 0;
+    }
+    --it;
+    assert(it != db->db.end());
+    ready = true;
+    return 0;
+  }
+
+  int seek_to_last(const string &prefix) override {
+    string tmp(prefix);
+    tmp.append(1, (char) 0);
+    it = db->db.upper_bound(make_pair(tmp,""));
+
+    if (db->db.empty() || (it == db->db.end())) {
+      seek_to_last();
+    }
+    else {
+      ready = true;
+      prev();
+    }
+    return 0;
+  }
+
+  int lower_bound(const string &prefix, const string &to) override {
+    it = db->db.lower_bound(make_pair(prefix,to));
+    if ((db->db.empty()) || (it == db->db.end())) {
+      it = db->db.end();
+      ready = false;
+      return 0;
+    }
+
+    assert(it != db->db.end());
+
+    ready = true;
+    return 0;
+  }
+
+  int upper_bound(const string &prefix, const string &after) override {
+    it = db->db.upper_bound(make_pair(prefix,after));
+    if ((db->db.empty()) || (it == db->db.end())) {
+      it = db->db.end();
+      ready = false;
+      return 0;
+    }
+    assert(it != db->db.end());
+    ready = true;
+    return 0;
+  }
+
+  bool valid() override {
+    return ready && (it != db->db.end());
+  }
+
+  bool begin() {
+    return ready && (it == db->db.begin());
+  }
+
+  int prev() override {
+    if (!begin() && ready)
+      --it;
+    else
+      it = db->db.end();
+    return 0;
+  }
+
+  int next() override {
+    if (valid())
+      ++it;
+    return 0;
+  }
+
+  string key() override {
+    if (valid())
+      return (*it).first.second;
+    else
+      return "";
+  }
+
+  pair<string,string> raw_key() override {
+    if (valid())
+      return (*it).first;
+    else
+      return make_pair("", "");
+  }
+  
+  bool raw_key_is_prefixed(const string &prefix) override {
+    return prefix == (*it).first.first;
+  }
+
+  bufferlist value() override {
+    if (valid())
+      return (*it).second;
+    else
+      return bufferlist();
+  }
+
+  int status() override {
+    return 0;
+  }
+};
+
+int KeyValueDBMemory::get(const string &prefix,
+			  const std::set<string> &key,
+			  map<string, bufferlist> *out) {
+  if (!exists_prefix(prefix))
+    return 0;
+
+  for (std::set<string>::const_iterator i = key.begin();
+       i != key.end();
+       ++i) {
+    pair<string,string> k(prefix, *i);
+    if (db.count(k))
+      (*out)[*i] = db[k];
+  }
+  return 0;
+}
+
+int KeyValueDBMemory::get_keys(const string &prefix,
+			       const std::set<string> &key,
+			       std::set<string> *out) {
+  if (!exists_prefix(prefix))
+    return 0;
+
+  for (std::set<string>::const_iterator i = key.begin();
+       i != key.end();
+       ++i) {
+    if (db.count(make_pair(prefix, *i)))
+      out->insert(*i);
+  }
+  return 0;
+}
+
+int KeyValueDBMemory::set(const string &prefix,
+			  const string &key,
+			  const bufferlist &bl) {
+  db[make_pair(prefix,key)] = bl;
+  return 0;
+}
+
+int KeyValueDBMemory::rmkey(const string &prefix,
+			    const string &key) {
+  db.erase(make_pair(prefix,key));
+  return 0;
+}
+
+int KeyValueDBMemory::rmkeys_by_prefix(const string &prefix) {
+  map<std::pair<string,string>,bufferlist>::iterator i;
+  i = db.lower_bound(make_pair(prefix, ""));
+  if (i == db.end())
+    return 0;
+
+  while (i != db.end()) {
+    std::pair<string,string> key = (*i).first;
+    if (key.first != prefix)
+      break;
+
+    ++i;
+    rmkey(key.first, key.second);
+  }
+  return 0;
+}
+
+int KeyValueDBMemory::rm_range_keys(const string &prefix, const string &start, const string &end) {
+  map<std::pair<string,string>,bufferlist>::iterator i;
+  i = db.lower_bound(make_pair(prefix, start));
+  if (i == db.end())
+    return 0;
+
+  while (i != db.end()) {
+    std::pair<string,string> key = (*i).first;
+    if (key.first != prefix)
+      break;
+    if (key.second >= end)
+      break;
+    ++i;
+    rmkey(key.first, key.second);
+  }
+  return 0;
+}
+
+KeyValueDB::WholeSpaceIterator KeyValueDBMemory::_get_iterator() {
+  return ceph::shared_ptr<KeyValueDB::WholeSpaceIteratorImpl>(
+    new WholeSpaceMemIterator(this)
+  );
+}
+
+class WholeSpaceSnapshotMemIterator : public WholeSpaceMemIterator {
+public:
+
+  /**
+   * @note
+   * We perform a copy of the db map, which is populated by bufferlists.
+   *
+   * These are designed as shallow containers, thus there is a chance that
+   * changing the underlying memory pages will lead to the iterator seeing
+   * erroneous states.
+   *
+   * Although we haven't verified this yet, there is this chance, so we should
+   * keep it in mind.
+   */
+
+  explicit WholeSpaceSnapshotMemIterator(KeyValueDBMemory *db) :
+    WholeSpaceMemIterator(db) { }
+  ~WholeSpaceSnapshotMemIterator() override {
+    delete db;
+  }
+};
+