Use CachingDataTreeStore instead of DataTreeStore to avoid opening the same datatree twice in different threads

biicode.conf

@@ -4,6 +4,7 @@
 	 google/gmock: 2
 	 google/gtest: 10
 	 messmer/blockstore: 1
+	 messmer/cachingstore: 0
 	 messmer/cmake: 3
 	 messmer/cpp-utils: 2
 

implementations/onblocks/BlobOnBlocks.cpp

@@ -1,6 +1,6 @@
 #include "BlobOnBlocks.h"
 
-#include "datatreestore/DataTree.h"
+#include "cachingdatatreestore/CachedDataTreeRef.h"
 #include "datanodestore/DataLeafNode.h"
 #include "utils/Math.h"
 #include <cmath>
@@ -14,9 +14,9 @@ using blockstore::Key;
 namespace blobstore {
 namespace onblocks {
 
-using datatreestore::DataTree;
+using cachingdatatreestore::CachedDataTreeRef;
 
-BlobOnBlocks::BlobOnBlocks(unique_ptr<DataTree> datatree)
+BlobOnBlocks::BlobOnBlocks(unique_ptr<CachedDataTreeRef> datatree)
 : _datatree(std::move(datatree)) {
 }
 
@@ -79,7 +79,7 @@ Key BlobOnBlocks::key() const {
   return _datatree->key();
 }
 
-unique_ptr<DataTree> BlobOnBlocks::releaseTree() {
+unique_ptr<CachedDataTreeRef> BlobOnBlocks::releaseTree() {
   return std::move(_datatree);
 }
 

implementations/onblocks/BlobOnBlocks.h

@@ -11,13 +11,13 @@ namespace onblocks {
 namespace datanodestore {
 class DataLeafNode;
 }
-namespace datatreestore {
-class DataTree;
+namespace cachingdatatreestore {
+class CachedDataTreeRef;
 }
 
 class BlobOnBlocks: public Blob {
 public:
-  BlobOnBlocks(std::unique_ptr<datatreestore::DataTree> datatree);
+  BlobOnBlocks(std::unique_ptr<cachingdatatreestore::CachedDataTreeRef> datatree);
   virtual ~BlobOnBlocks();
 
   blockstore::Key key() const override;
@@ -29,14 +29,14 @@ public:
   uint64_t tryRead(void *target, uint64_t offset, uint64_t size) const override;
   void write(const void *source, uint64_t offset, uint64_t size) override;
 
-  std::unique_ptr<datatreestore::DataTree> releaseTree();
+  std::unique_ptr<cachingdatatreestore::CachedDataTreeRef> releaseTree();
 
 private:
 
   void traverseLeaves(uint64_t offsetBytes, uint64_t sizeBytes, std::function<void (uint64_t, datanodestore::DataLeafNode *, uint32_t, uint32_t)>) const;
   void resizeIfSmallerThan(uint64_t neededSize);
 
-  std::unique_ptr<datatreestore::DataTree> _datatree;
+  std::unique_ptr<cachingdatatreestore::CachedDataTreeRef> _datatree;
 };
 
 }

implementations/onblocks/BlobStoreOnBlocks.cpp

@@ -3,6 +3,8 @@
 #include "datanodestore/DataNodeStore.h"
 #include "datatreestore/DataTreeStore.h"
 #include "datatreestore/DataTree.h"
+#include "cachingdatatreestore/CachingDataTreeStore.h"
+#include "cachingdatatreestore/CachedDataTreeRef.h"
 #include "BlobStoreOnBlocks.h"
 #include "BlobOnBlocks.h"
 #include <messmer/cpp-utils/pointer.h>
@@ -20,9 +22,10 @@ namespace onblocks {
 
 using datanodestore::DataNodeStore;
 using datatreestore::DataTreeStore;
+using cachingdatatreestore::CachingDataTreeStore;
 
 BlobStoreOnBlocks::BlobStoreOnBlocks(unique_ptr<BlockStore> blockStore, uint32_t blocksizeBytes)
-: _dataTreeStore(make_unique<DataTreeStore>(make_unique<DataNodeStore>(make_unique<CachingBlockStore>(std::move(blockStore)), blocksizeBytes))) {
+: _dataTreeStore(make_unique<CachingDataTreeStore>(make_unique<DataTreeStore>(make_unique<DataNodeStore>(make_unique<CachingBlockStore>(std::move(blockStore)), blocksizeBytes)))) {
 }
 
 BlobStoreOnBlocks::~BlobStoreOnBlocks() {

implementations/onblocks/BlobStoreOnBlocks.h

@@ -7,8 +7,8 @@
 
 namespace blobstore {
 namespace onblocks {
-namespace datatreestore {
-class DataTreeStore;
+namespace cachingdatatreestore {
+class CachingDataTreeStore;
 }
 
 class BlobStoreOnBlocks: public BlobStore {
@@ -22,7 +22,7 @@ public:
   void remove(std::unique_ptr<Blob> blob) override;
 
 private:
-  std::unique_ptr<datatreestore::DataTreeStore> _dataTreeStore;
+  std::unique_ptr<cachingdatatreestore::CachingDataTreeStore> _dataTreeStore;
 };
 
 }

implementations/onblocks/cachingdatatreestore/CachedDataTreeRef.cpp

@@ -0,0 +1 @@
+#include "CachedDataTreeRef.h"

implementations/onblocks/cachingdatatreestore/CachedDataTreeRef.h

@@ -0,0 +1,47 @@
+#pragma once
+#ifndef MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_DATATREEREF_H_
+#define MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_DATATREEREF_H_
+
+#include "../datatreestore/DataTree.h"
+#include <messmer/cachingstore/CachingStore.h>
+
+namespace blobstore {
+namespace onblocks {
+namespace cachingdatatreestore {
+
+class CachedDataTreeRef: public cachingstore::CachingStore<datatreestore::DataTree, CachedDataTreeRef, blockstore::Key>::CachedResource {
+public:
+  CachedDataTreeRef(datatreestore::DataTree *baseTree): _baseTree(baseTree) {}
+
+  const blockstore::Key &key() const {
+    return _baseTree->key();
+  }
+
+  uint32_t maxBytesPerLeaf() const {
+    return _baseTree->maxBytesPerLeaf();
+  }
+
+  void traverseLeaves(uint32_t beginIndex, uint32_t endIndex, std::function<void (const datanodestore::DataLeafNode*, uint32_t)> func) const {
+    return const_cast<const datatreestore::DataTree*>(_baseTree)->traverseLeaves(beginIndex, endIndex, func);
+  }
+
+  void traverseLeaves(uint32_t beginIndex, uint32_t endIndex, std::function<void (datanodestore::DataLeafNode*, uint32_t)> func) {
+    return _baseTree->traverseLeaves(beginIndex, endIndex, func);
+  }
+
+  void resizeNumBytes(uint64_t newNumBytes) {
+    return _baseTree->resizeNumBytes(newNumBytes);
+  }
+
+  uint64_t numStoredBytes() const {
+    return _baseTree->numStoredBytes();
+  }
+private:
+  datatreestore::DataTree *_baseTree;
+};
+
+}
+}
+}
+
+#endif

implementations/onblocks/cachingdatatreestore/CachingDataTreeStore.cpp

@@ -0,0 +1,43 @@
+#include "CachingDataTreeStore.h"
+#include "../datanodestore/DataNodeStore.h"
+#include "../datanodestore/DataLeafNode.h"
+#include "CachingDataTreeStoreAdapter.h"
+#include "CachedDataTreeRef.h"
+
+using std::unique_ptr;
+using std::make_unique;
+
+using blobstore::onblocks::datatreestore::DataTreeStore;
+using blockstore::Key;
+
+namespace blobstore {
+namespace onblocks {
+using datatreestore::DataTreeStore;
+using datatreestore::DataTree;
+namespace cachingdatatreestore {
+
+CachingDataTreeStore::CachingDataTreeStore(unique_ptr<DataTreeStore> dataTreeStore)
+  : _dataTreeStore(std::move(dataTreeStore)), _cachingStore(make_unique<CachingDataTreeStoreAdapter>(_dataTreeStore.get())) {
+}
+
+CachingDataTreeStore::~CachingDataTreeStore() {
+}
+
+unique_ptr<CachedDataTreeRef> CachingDataTreeStore::load(const blockstore::Key &key) {
+  return _cachingStore.load(key);
+}
+
+unique_ptr<CachedDataTreeRef> CachingDataTreeStore::createNewTree() {
+  auto dataTree = _dataTreeStore->createNewTree();
+  Key key = dataTree->key();
+  return _cachingStore.add(key, std::move(dataTree));
+}
+
+void CachingDataTreeStore::remove(unique_ptr<CachedDataTreeRef> tree) {
+  Key key = tree->key();
+  return _cachingStore.remove(key, std::move(tree));
+}
+
+}
+}
+}

implementations/onblocks/cachingdatatreestore/CachingDataTreeStore.h

@@ -0,0 +1,43 @@
+#pragma once
+#ifndef BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_CACHINGDATATREESTORE_H_
+#define BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_CACHINGDATATREESTORE_H_
+
+#include <memory>
+#include <messmer/cpp-utils/macros.h>
+#include <messmer/cachingstore/CachingStore.h>
+
+namespace blockstore{
+class Key;
+}
+namespace blobstore {
+namespace onblocks {
+namespace datatreestore {
+class DataTreeStore;
+class DataTree;
+}
+namespace cachingdatatreestore {
+class CachedDataTreeRef;
+
+class CachingDataTreeStore {
+public:
+  CachingDataTreeStore(std::unique_ptr<datatreestore::DataTreeStore> dataTreeStore);
+  virtual ~CachingDataTreeStore();
+
+  std::unique_ptr<CachedDataTreeRef> load(const blockstore::Key &key);
+
+  std::unique_ptr<CachedDataTreeRef> createNewTree();
+
+  void remove(std::unique_ptr<CachedDataTreeRef> tree);
+
+private:
+  std::unique_ptr<datatreestore::DataTreeStore> _dataTreeStore;
+  cachingstore::CachingStore<datatreestore::DataTree, CachedDataTreeRef, blockstore::Key> _cachingStore;
+
+  DISALLOW_COPY_AND_ASSIGN(CachingDataTreeStore);
+};
+
+}
+}
+}
+
+#endif

implementations/onblocks/cachingdatatreestore/CachingDataTreeStoreAdapter.cpp

@@ -0,0 +1 @@
+#include "CachingDataTreeStoreAdapter.h"

implementations/onblocks/cachingdatatreestore/CachingDataTreeStoreAdapter.h

@@ -0,0 +1,37 @@
+#ifndef MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_CACHINGDATATREESTOREADAPTER_H_
+#define MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_CACHINGDATATREESTORE_CACHINGDATATREESTOREADAPTER_H_
+
+#include <messmer/cpp-utils/macros.h>
+#include <messmer/cachingstore/CachingStore.h>
+#include "../datatreestore/DataTreeStore.h"
+#include "../datatreestore/DataTree.h"
+
+namespace blobstore {
+namespace onblocks {
+namespace cachingdatatreestore {
+
+class CachingDataTreeStoreAdapter: public cachingstore::CachingBaseStore<datatreestore::DataTree, blockstore::Key> {
+public:
+  CachingDataTreeStoreAdapter(datatreestore::DataTreeStore *baseDataTreeStore)
+    :_baseDataTreeStore(std::move(baseDataTreeStore)) {
+  }
+
+  std::unique_ptr<datatreestore::DataTree> loadFromBaseStore(const blockstore::Key &key) override {
+	  return _baseDataTreeStore->load(key);
+  }
+
+  void removeFromBaseStore(std::unique_ptr<datatreestore::DataTree> dataTree) override {
+	  return _baseDataTreeStore->remove(std::move(dataTree));
+  }
+
+private:
+  datatreestore::DataTreeStore *_baseDataTreeStore;
+
+  DISALLOW_COPY_AND_ASSIGN(CachingDataTreeStoreAdapter);
+};
+
+}
+}
+}
+
+#endif

implementations/onblocks/datatreestore/DataTreeStore.h

@@ -3,7 +3,7 @@
 #define BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_DATATREESTORE_DATATREESTORE_H_
 
 #include <memory>
-#include "messmer/cpp-utils/macros.h"
+#include <messmer/cpp-utils/macros.h>
 
 namespace blockstore{
 class Key;