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// See docs in ../ops/io_ops.cc.
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/framework/queue_interface.h"
#include "tensorflow/core/framework/reader_interface.h"
#include "tensorflow/core/public/tensor_shape.h"
namespace tensorflow {
class ReaderVerbOpKernel : public OpKernel {
public:
using OpKernel::OpKernel;
void Compute(OpKernelContext* context) override {
ReaderInterface* reader;
OP_REQUIRES_OK(context,
GetResourceFromContext(context, "reader_handle", &reader));
ComputeWithReader(context, reader);
reader->Unref();
}
protected:
virtual void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) = 0;
};
class ReaderReadOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
QueueInterface* queue;
OP_REQUIRES_OK(context,
GetResourceFromContext(context, "queue_handle", &queue));
core::ScopedUnref unref_me(queue);
Tensor* key = nullptr;
OP_REQUIRES_OK(context,
context->allocate_output("key", TensorShape({}), &key));
Tensor* value = nullptr;
OP_REQUIRES_OK(context,
context->allocate_output("value", TensorShape({}), &value));
auto key_scalar = key->scalar<string>();
auto value_scalar = value->scalar<string>();
reader->Read(queue, &key_scalar(), &value_scalar(), context);
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderRead").Device(DEVICE_CPU), ReaderReadOp);
class ReaderNumRecordsProducedOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
Tensor* output = nullptr;
OP_REQUIRES_OK(context, context->allocate_output("records_produced",
TensorShape({}), &output));
output->scalar<int64>()() = reader->NumRecordsProduced();
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderNumRecordsProduced").Device(DEVICE_CPU),
ReaderNumRecordsProducedOp);
class ReaderNumWorkUnitsCompletedOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
Tensor* output = nullptr;
OP_REQUIRES_OK(context, context->allocate_output("units_completed",
TensorShape({}), &output));
output->scalar<int64>()() = reader->NumWorkUnitsCompleted();
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderNumWorkUnitsCompleted").Device(DEVICE_CPU),
ReaderNumWorkUnitsCompletedOp);
class ReaderSerializeStateOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
Tensor* output = nullptr;
OP_REQUIRES_OK(context,
context->allocate_output("state", TensorShape({}), &output));
OP_REQUIRES_OK(context,
reader->SerializeState(&output->scalar<string>()()));
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderSerializeState").Device(DEVICE_CPU),
ReaderSerializeStateOp);
class ReaderRestoreStateOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
const Tensor* tensor;
OP_REQUIRES_OK(context, context->input("state", &tensor));
OP_REQUIRES(
context, TensorShapeUtils::IsScalar(tensor->shape()),
errors::InvalidArgument("Reader state must be scalar, but had shape: ",
tensor->shape().DebugString()));
OP_REQUIRES_OK(context, reader->RestoreState(tensor->scalar<string>()()));
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderRestoreState").Device(DEVICE_CPU),
ReaderRestoreStateOp);
class ReaderResetOp : public ReaderVerbOpKernel {
public:
using ReaderVerbOpKernel::ReaderVerbOpKernel;
void ComputeWithReader(OpKernelContext* context,
ReaderInterface* reader) override {
OP_REQUIRES_OK(context, reader->Reset());
}
};
REGISTER_KERNEL_BUILDER(Name("ReaderReset").Device(DEVICE_CPU), ReaderResetOp);
} // namespace tensorflow
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