Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/google/cacheinvalidation/impl/run-state.h

Index: third_party/cacheinvalidation/src/google/cacheinvalidation/impl/run-state.h
diff --git a/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/run-state.h b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/run-state.h
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index 0000000000000000000000000000000000000000..f330438a637203d7bffddcf383daa9ac74e3c960
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+++ b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/run-state.h
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+// Copyright 2012 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// An abstraction that keeps track of whether the caller is started or stopped
+// and only allows the following transitions NOT_STARTED -> STARTED ->
+// STOPPED. This class is thread-safe.
+
+#ifndef GOOGLE_CACHEINVALIDATION_IMPL_RUN_STATE_H_
+#define GOOGLE_CACHEINVALIDATION_IMPL_RUN_STATE_H_
+
+#include "google/cacheinvalidation/client.pb.h"
+#include "google/cacheinvalidation/deps/logging.h"
+#include "google/cacheinvalidation/deps/mutex.h"
+#include "google/cacheinvalidation/deps/string_util.h"
+
+namespace invalidation {
+
+using ::ipc::invalidation::RunStateP_State;
+using ::ipc::invalidation::RunStateP_State_NOT_STARTED;
+using ::ipc::invalidation::RunStateP_State_STARTED;
+using ::ipc::invalidation::RunStateP_State_STOPPED;
+
+class RunState {
+ public:
+  RunState() : current_state_(RunStateP_State_NOT_STARTED) {}
+
+  /* Marks the current state to be STARTED.
+   *
+   * REQUIRES: Current state is NOT_STARTED.
+   */
+  void Start() {
+    MutexLock m(&lock_);
+    CHECK(current_state_ == RunStateP_State_NOT_STARTED) << "Cannot start: "
+        << current_state_;
+    current_state_ = RunStateP_State_STARTED;
+  }
+
+  /* Marks the current state to be STOPPED.
+   *
+   * REQUIRES: Current state is STARTED.
+   */
+  void Stop() {
+    MutexLock m(&lock_);
+    CHECK(current_state_ == RunStateP_State_STARTED) << "Cannot stop: "
+        << current_state_;
+    current_state_ = RunStateP_State_STOPPED;
+  }
+
+  /* Returns true iff Start has been called on this but Stop has not been
+   * called.
+   */
+  bool IsStarted() const {
+    // Don't treat locking a mutex as mutation.
+    MutexLock m((Mutex *) &lock_);  // NOLINT
+    return current_state_ == RunStateP_State_STARTED;
+  }
+
+  /* Returns true iff Start and Stop have been called on this object. */
+  bool IsStopped() const {
+    // Don't treat locking a mutex as mutation.
+    MutexLock m((Mutex *) &lock_);  // NOLINT
+    return current_state_ == RunStateP_State_STOPPED;
+  }
+
+  string ToString() {
+    return StringPrintf("<RunState %d>", current_state_);
+  }
+
+ private:
+  RunStateP_State current_state_;
+  Mutex lock_;
+};
+
+}  // namespace invalidation
+
+#endif  // GOOGLE_CACHEINVALIDATION_IMPL_RUN_STATE_H_