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base/file_descriptor_store.cc

Index: base/file_descriptor_store.cc
diff --git a/base/file_descriptor_store.cc b/base/file_descriptor_store.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4a3c233b7fefb2c00a1510ad579c7a120958fda1
--- /dev/null
+++ b/base/file_descriptor_store.cc
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+// Copyright 2017 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 "base/file_descriptor_store.h"
+
+#include <utility>
+#include <vector>
+
+#include "base/logging.h"
+
+namespace base {
+
+FileDescriptorStore::Descriptor::Descriptor(const std::string& key, int fd)
+    : key(key), fd(fd), region(base::MemoryMappedFile::Region::kWholeFile) {}
+
+FileDescriptorStore::Descriptor::Descriptor(
+    const std::string& key,
+    int fd,
+    base::MemoryMappedFile::Region region)
+    : key(key), fd(fd), region(region) {}
+
+// static
+FileDescriptorStore* FileDescriptorStore::GetInstance() {
+  typedef Singleton<base::FileDescriptorStore,
+                    LeakySingletonTraits<base::FileDescriptorStore>>
+      FileDescriptorStoreSingleton;
+  return FileDescriptorStoreSingleton::get();
+}
+
+int FileDescriptorStore::Get(const std::string& key) const {
+  const int ret = MaybeGet(key);
+
+  if (ret == -1)
+    DLOG(FATAL) << "Unknown global descriptor: " << key;
+  return ret;
+}
+
+int FileDescriptorStore::MaybeGet(const std::string& key) const {
+  for (Mapping::const_iterator i = descriptors_.begin();
+       i != descriptors_.end(); ++i) {
+    if (i->key == key)
+      return i->fd;
+  }
+  return -1;
+}
+
+void FileDescriptorStore::Set(const std::string& key, int fd) {
+  Set(key, fd, base::MemoryMappedFile::Region::kWholeFile);
+}
+
+void FileDescriptorStore::Set(const std::string& key,
+                              int fd,
+                              base::MemoryMappedFile::Region region) {
+  for (auto& i : descriptors_) {
+    if (i.key == key) {
+      i.fd = fd;
+      i.region = region;
+      return;
+    }
+  }
+
+  descriptors_.push_back(Descriptor(key, fd, region));
+}
+
+base::MemoryMappedFile::Region FileDescriptorStore::GetRegion(
+    const std::string& key) const {
+  for (const auto& i : descriptors_) {
+    if (i.key == key)
+      return i.region;
+  }
+  DLOG(FATAL) << "Unknown global descriptor: " << key;
+  return base::MemoryMappedFile::Region::kWholeFile;
+}
+
+void FileDescriptorStore::Reset(const Mapping& mapping) {
+  descriptors_ = mapping;
+}
+
+FileDescriptorStore::FileDescriptorStore() {}
+
+FileDescriptorStore::~FileDescriptorStore() {}
+
+}  // namespace base