tensorflow-core-framework-function_handle_cache.h

```cpp
#ifndef TENSORFLOW_CORE_FRAMEWORK_FUNCTION_HANDLE_CACHE_H_
#define TENSORFLOW_CORE_FRAMEWORK_FUNCTION_HANDLE_CACHE_H_

#include <string>

#include "tensorflow/core/framework/function.h"

namespace tensorflow {
namespace data {

class FunctionHandleCache {
 public:
  explicit FunctionHandleCache(FunctionLibraryRuntime* lib);

~FunctionHandleCache();

// Looks up the function to be instantiated in the cache first. If present,
  // returns handle from there. Otherwise, instantiates a new function
  // and stores handle in the cache.
  Status Instantiate(const string& function_name, AttrSlice attrs,
                     FunctionLibraryRuntime::InstantiateOptions options,
                     FunctionLibraryRuntime::Handle* handle);

// Releases all the handles in the cache, clearing out the state for all
  // functions involved.
  Status Clear();

private:
  mutex mu_;
  FunctionLibraryRuntime* lib_ = nullptr;  // not owned
  const string state_handle_;
  std::unordered_map<string, FunctionLibraryRuntime::Handle> handles_
      GUARDED_BY(mu_);
};

}  // namespace data
}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_FRAMEWORK_FUNCTION_HANDLE_CACHE_H_
```

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