| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef SRC_TRACING_CORE_NULL_TRACE_WRITER_H_ |
| #define SRC_TRACING_CORE_NULL_TRACE_WRITER_H_ |
| |
| #include "perfetto/protozero/message_handle.h" |
| #include "perfetto/protozero/scattered_stream_null_delegate.h" |
| #include "perfetto/tracing/core/trace_writer.h" |
| |
| namespace perfetto { |
| |
| // A specialization of TraceWriter which no-ops all the writes routing them |
| // into a fixed region of memory |
| // See //include/perfetto/tracing/core/trace_writer.h for docs. |
| class NullTraceWriter : public TraceWriter { |
| public: |
| NullTraceWriter(); |
| ~NullTraceWriter() override; |
| |
| // TraceWriter implementation. See documentation in trace_writer.h. |
| // TracePacketHandle is defined in trace_writer.h |
| TracePacketHandle NewTracePacket() override; |
| void Flush(std::function<void()> callback = {}) override; |
| WriterID writer_id() const override; |
| uint64_t written() const override; |
| |
| private: |
| NullTraceWriter(const NullTraceWriter&) = delete; |
| NullTraceWriter& operator=(const NullTraceWriter&) = delete; |
| |
| protozero::ScatteredStreamWriterNullDelegate delegate_; |
| protozero::ScatteredStreamWriter stream_; |
| |
| // The packet returned via NewTracePacket(). Its owned by this class, |
| // TracePacketHandle has just a pointer to it. |
| std::unique_ptr<protos::pbzero::TracePacket> cur_packet_; |
| }; |
| |
| } // namespace perfetto |
| |
| #endif // SRC_TRACING_CORE_NULL_TRACE_WRITER_H_ |