Initial version of Blimp BlobCache.

blimp/common/blob_cache/in_memory_blob_cache.cc

Index: blimp/common/blob_cache/in_memory_blob_cache.cc
diff --git a/blimp/common/blob_cache/in_memory_blob_cache.cc b/blimp/common/blob_cache/in_memory_blob_cache.cc
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+++ b/blimp/common/blob_cache/in_memory_blob_cache.cc
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "blimp/common/blob_cache/in_memory_blob_cache.h"
+
+#include "base/logging.h"
+#include "base/sha1.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+
+namespace blimp {
+
+InMemoryBlobCache::InMemoryBlobCache() {}
+
+InMemoryBlobCache::~InMemoryBlobCache() {}
+
+void InMemoryBlobCache::Put(const BlobId& id, BlobData data) {
+  if (Contains(id)) {
+    // In cases where the engine has miscalculated what is already available
+    // on the client, Put() might be called unnecessarily, which should be
+    // ignored.
+    VLOG(2) << "Item with ID " << id << " already exists in cache.";
+    return;
+  }
+  cache_.insert(std::make_pair(id, std::move(data)));
+}
+
+bool InMemoryBlobCache::Contains(const BlobId& id) const {
+  return cache_.find(id) != cache_.end();
+}
+
+BlobData InMemoryBlobCache::Get(const BlobId& id) const {
+  if (!Contains(id)) {
+    return nullptr;
+  }
+
+  return cache_.find(id)->second;
+}
+
+}  // namespace blimp