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 #include <optional> 23 24 #include "perfetto/ext/base/flat_hash_map.h" 25 26 #include "perfetto/ext/base/status_or.h" 27 #include "src/trace_processor/importers/common/trace_parser.h" 28 #include "src/trace_processor/sorter/trace_sorter.h" 29 #include "src/trace_processor/util/trace_type.h" 30 31 namespace perfetto { 32 namespace trace_processor { 33 34 class ChunkedTraceReader; 35 class TraceProcessorContext; 36 37 // Maps `TraceType` values to `ChunkedTraceReader` subclasses. 38 // This class is used to create `ChunkedTraceReader` instances for a given 39 // `TraceType`. 40 class TraceReaderRegistry { 41 public: TraceReaderRegistry(TraceProcessorContext * context)42 explicit TraceReaderRegistry(TraceProcessorContext* context) 43 : context_(context) {} 44 45 // Registers a mapping from `TraceType` value to `ChunkedTraceReader` 46 // subclass. Only one such mapping can be registered per `TraceType` value. 47 template <typename Reader> RegisterTraceReader(TraceType trace_type)48 void RegisterTraceReader(TraceType trace_type) { 49 RegisterFactory(trace_type, [](TraceProcessorContext* ctxt) { 50 return std::make_unique<Reader>(ctxt); 51 }); 52 } 53 54 // Creates a new `ChunkedTraceReader` instance for the given `type`. Returns 55 // an error if no mapping has been previously registered. 56 base::StatusOr<std::unique_ptr<ChunkedTraceReader>> CreateTraceReader( 57 TraceType type); 58 59 private: 60 using Factory = std::function<std::unique_ptr<ChunkedTraceReader>( 61 TraceProcessorContext*)>; 62 void RegisterFactory(TraceType trace_type, Factory factory); 63 64 TraceProcessorContext* const context_; 65 base::FlatHashMap<TraceType, 66 std::function<std::unique_ptr<ChunkedTraceReader>( 67 TraceProcessorContext*)>> 68 factories_; 69 }; 70 71 } // namespace trace_processor 72 } // namespace perfetto 73 74 #endif // SRC_TRACE_PROCESSOR_TRACE_READER_REGISTRY_H_ 75