1/*
2 * Copyright (C) 2013 Google Inc.
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
17package com.google.caliper.bridge;
18
19import static java.util.concurrent.TimeUnit.SECONDS;
20
21import com.google.caliper.util.Parser;
22import com.google.caliper.util.ShortDuration;
23
24import java.math.BigDecimal;
25import java.util.regex.Matcher;
26import java.util.regex.Pattern;
27
28import javax.inject.Inject;
29
30/**
31 * Parses {@link LogMessage} strings.
32 */
33final class LogMessageParser implements Parser<LogMessage> {
34  @Inject LogMessageParser() {}
35
36  private static final Pattern GC_PATTERN =
37      Pattern.compile(".*\\[(?:(Full) )?GC.*(\\d+\\.\\d+) secs\\]");
38  private static final Pattern JIT_PATTERN =
39      Pattern.compile(".*::.*( \\(((\\d+ bytes)|(static))\\))?");
40  private static final Pattern VM_OPTION_PATTERN =
41      Pattern.compile("\\s*(\\w+)\\s+(\\w+)\\s+:?=\\s+([^\\s]*)\\s+\\{([^}]*)\\}\\s*");
42
43  @Override public LogMessage parse(CharSequence text) {
44    // TODO(gak): do this stuff in terms of CharSequence instead of String
45    String string = text.toString();
46    Matcher gcMatcher = GC_PATTERN.matcher(string);
47    if (gcMatcher.matches()) {
48      return new GcLogMessage(
49          "Full".equals(gcMatcher.group(1))
50              ? GcLogMessage.Type.FULL
51              : GcLogMessage.Type.INCREMENTAL,
52          ShortDuration.of(BigDecimal.valueOf(Double.parseDouble(gcMatcher.group(2))), SECONDS));
53    }
54    Matcher jitMatcher = JIT_PATTERN.matcher(string);
55    if (jitMatcher.matches()) {
56      return new HotspotLogMessage();
57    }
58    Matcher vmOptionMatcher = VM_OPTION_PATTERN.matcher(string);
59    if (vmOptionMatcher.matches()) {
60      return new VmOptionLogMessage(vmOptionMatcher.group(2), vmOptionMatcher.group(3));
61    }
62    return null;
63  }
64}
65