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#ifndef TENSORFLOW_FRAMEWORK_QUEUE_INTERFACE_H_
#define TENSORFLOW_FRAMEWORK_QUEUE_INTERFACE_H_
#include <string>
#include <vector>
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/framework/resource_mgr.h"
#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/platform/port.h"
#include "tensorflow/core/public/tensor.h"
namespace tensorflow {
// All implementations must be thread-safe.
class QueueInterface : public ResourceBase {
public:
typedef std::vector<Tensor> Tuple;
typedef AsyncOpKernel::DoneCallback DoneCallback;
typedef std::function<void(const Tuple&)> CallbackWithTuple;
virtual Status ValidateTuple(const Tuple& tuple) = 0;
virtual Status ValidateManyTuple(const Tuple& tuple) = 0;
// Stashes a function object for future execution, that will eventually
// enqueue the tuple of tensors into the queue, and returns immediately. The
// function object is guaranteed to call 'callback'.
virtual void TryEnqueue(const Tuple& tuple, OpKernelContext* ctx,
DoneCallback callback) = 0;
// Same as above, but the component tensors are sliced along the 0th dimension
// to make multiple queue-element components.
virtual void TryEnqueueMany(const Tuple& tuple, OpKernelContext* ctx,
DoneCallback callback) = 0;
// Stashes a function object for future execution, that will eventually
// dequeue an element from the queue and call 'callback' with that tuple
// element as argument.
virtual void TryDequeue(OpKernelContext* ctx, CallbackWithTuple callback) = 0;
// Same as above, but the stashed function object will attempt to dequeue
// num_elements items.
virtual void TryDequeueMany(int num_elements, OpKernelContext* ctx,
CallbackWithTuple callback) = 0;
// Signals that no more elements will be enqueued, and optionally
// cancels pending Enqueue(Many) operations.
//
// After calling this function, subsequent calls to Enqueue(Many)
// will fail. If `cancel_pending_enqueues` is true, all pending
// calls to Enqueue(Many) will fail as well.
//
// After calling this function, all current and subsequent calls to
// Dequeue(Many) will fail instead of blocking (though they may
// succeed if they can be satisfied by the elements in the queue at
// the time it was closed).
virtual void Close(OpKernelContext* ctx, bool cancel_pending_enqueues,
DoneCallback callback) = 0;
// Assuming *this represents a shared queue, verify that it matches
// another instantiation indicated by node_def.
virtual Status MatchesNodeDef(const NodeDef& node_def) = 0;
// Returns the number of elements in the queue.
virtual int32 size() = 0;
virtual const DataTypeVector& component_dtypes() const = 0;
string DebugString() override { return "A queue"; }
protected:
virtual ~QueueInterface() {}
};
} // namespace tensorflow
#endif // TENSORFLOW_FRAMEWORK_QUEUE_INTERFACE_H_
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