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Extract the Perfetto config parsing to its own class.
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gapic/src/main/com/google/gapid/perfetto/PerfettoConfig.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * Copyright (C) 2019 Google Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
| package com.google.gapid.perfetto; | ||
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|
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| import static java.util.logging.Level.WARNING; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import com.google.gapid.util.Flags; | ||
| import com.google.gapid.util.Flags.Flag; | ||
| import com.google.protobuf.TextFormat; | ||
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|
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| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.io.Reader; | ||
| import java.util.function.Supplier; | ||
| import java.util.logging.Logger; | ||
|
|
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| public class PerfettoConfig { | ||
| public static final Flag<String> perfettoConfig = Flags.value("perfetto", "", | ||
| "Path to a file containing a perfetto trace config proto in text format. " + | ||
| "Specifying this flag will enable the Perfetto tracing UI features"); | ||
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| private static final Logger LOG = Logger.getLogger(PerfettoConfig.class.getName()); | ||
| private static final PerfettoConfig MISSING = new PerfettoConfig(null); | ||
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| private static PerfettoConfig instance; | ||
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| private final perfetto.protos.PerfettoConfig.TraceConfig config; | ||
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| public PerfettoConfig(perfetto.protos.PerfettoConfig.TraceConfig config) { | ||
| this.config = config; | ||
| } | ||
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| public static synchronized PerfettoConfig get() { | ||
| if (instance == null) { | ||
| instance = findConfig(); | ||
| } | ||
| return instance; | ||
| } | ||
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| public boolean hasConfig() { | ||
| return config != null; | ||
| } | ||
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| public perfetto.protos.PerfettoConfig.TraceConfig getConfig() { | ||
| return config; | ||
| } | ||
|
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| private static PerfettoConfig findConfig() { | ||
| return ImmutableList.<Supplier<File>>of( | ||
| () -> { | ||
| String path = perfettoConfig.get(); | ||
| return "".equals(path) ? null : new File(path); | ||
| } | ||
| ).stream() | ||
| .map(dir -> checkForConfig(dir.get())) | ||
| .filter(PerfettoConfig::shouldUse) | ||
| .findFirst() | ||
| .orElse(MISSING); | ||
| } | ||
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| private static boolean shouldUse(PerfettoConfig config) { | ||
| return config != null && config.hasConfig(); | ||
| } | ||
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| private static PerfettoConfig checkForConfig(File file) { | ||
| if (file == null || !file.isFile()) { | ||
| return null; | ||
| } | ||
| try (Reader in = new InputStreamReader(new FileInputStream(file))) { | ||
| perfetto.protos.PerfettoConfig.TraceConfig.Builder config = | ||
| perfetto.protos.PerfettoConfig.TraceConfig.newBuilder(); | ||
| TextFormat.merge(in, config); | ||
| return new PerfettoConfig(config.build()); | ||
| } catch (IOException e) { | ||
| LOG.log(WARNING, "Failed to read Perfetto config from " + file, e); | ||
| } | ||
| return null; | ||
| } | ||
| } |
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