1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_TRACE_READER_REGISTRY_H_ 18 #define SRC_TRACE_PROCESSOR_TRACE_READER_REGISTRY_H_ 19 20 #include <functional> 21 #include <memory> 22 23 #include "perfetto/ext/base/flat_hash_map.h" 24 #include "perfetto/ext/base/status_or.h" 25 #include "src/trace_processor/util/trace_type.h" 26 27 namespace perfetto { 28 namespace trace_processor { 29 30 class ChunkedTraceReader; 31 class TraceProcessorContext; 32 33 // Maps `TraceType` values to `ChunkedTraceReader` subclasses. 34 // This class is used to create `ChunkedTraceReader` instances for a given 35 // `TraceType`. 36 class TraceReaderRegistry { 37 public: TraceReaderRegistry(TraceProcessorContext * context)38 explicit TraceReaderRegistry(TraceProcessorContext* context) 39 : context_(context) {} 40 41 // Registers a mapping from `TraceType` value to `ChunkedTraceReader` 42 // subclass. Only one such mapping can be registered per `TraceType` value. 43 template <typename Reader> RegisterTraceReader(TraceType trace_type)44 void RegisterTraceReader(TraceType trace_type) { 45 RegisterFactory(trace_type, [](TraceProcessorContext* ctxt) { 46 return std::make_unique<Reader>(ctxt); 47 }); 48 } 49 50 // Creates a new `ChunkedTraceReader` instance for the given `type`. Returns 51 // an error if no mapping has been previously registered. 52 base::StatusOr<std::unique_ptr<ChunkedTraceReader>> CreateTraceReader( 53 TraceType type); 54 55 private: 56 using Factory = std::function<std::unique_ptr<ChunkedTraceReader>( 57 TraceProcessorContext*)>; 58 void RegisterFactory(TraceType trace_type, Factory factory); 59 60 TraceProcessorContext* const context_; 61 base::FlatHashMap<TraceType, 62 std::function<std::unique_ptr<ChunkedTraceReader>( 63 TraceProcessorContext*)>> 64 factories_; 65 }; 66 67 } // namespace trace_processor 68 } // namespace perfetto 69 70 #endif // SRC_TRACE_PROCESSOR_TRACE_READER_REGISTRY_H_ 71