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| 1 | +/* |
| 2 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 3 | + * you may not use this file except in compliance with the License. |
| 4 | + * You may obtain a copy of the License at |
| 5 | + * |
| 6 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | + * |
| 8 | + * Unless required by applicable law or agreed to in writing, software |
| 9 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | + * See the License for the specific language governing permissions and |
| 12 | + * limitations under the License. |
| 13 | + */ |
| 14 | +package io.airlift.units; |
| 15 | + |
| 16 | +import java.io.IOException; |
| 17 | +import java.nio.file.Path; |
| 18 | +import java.nio.file.Paths; |
| 19 | +import java.util.OptionalInt; |
| 20 | +import java.util.function.Supplier; |
| 21 | +import java.util.stream.Stream; |
| 22 | + |
| 23 | +import static io.airlift.units.Preconditions.checkArgument; |
| 24 | +import static java.lang.Math.min; |
| 25 | +import static java.lang.Math.round; |
| 26 | +import static java.lang.Math.toIntExact; |
| 27 | +import static java.lang.String.format; |
| 28 | +import static java.nio.file.Files.exists; |
| 29 | +import static java.nio.file.Files.lines; |
| 30 | + |
| 31 | +// This class is a copy from airlift's units due to an inability to use |
| 32 | +// newer units version in JDBC due to different JDK target. |
| 33 | +// It is temporary solution until client and JDBC are moved to JDK 11+. |
| 34 | +// This class is added to test classes, so it won't be a part of the jdbc driver. |
| 35 | +public class ThreadCount |
| 36 | + implements Comparable<ThreadCount> |
| 37 | +{ |
| 38 | + private static final String PER_CORE_SUFFIX = "C"; |
| 39 | + private static final Supplier<Integer> AVAILABLE_PROCESSORS = MachineInfo::getAvailablePhysicalProcessorCount; |
| 40 | + private final int threadCount; |
| 41 | + |
| 42 | + ThreadCount(int threadCount) |
| 43 | + { |
| 44 | + checkArgument(threadCount >= 0, "Thread count cannot be negative"); |
| 45 | + this.threadCount = threadCount; |
| 46 | + } |
| 47 | + |
| 48 | + public int getThreadCount() |
| 49 | + { |
| 50 | + return threadCount; |
| 51 | + } |
| 52 | + |
| 53 | + public static ThreadCount exactValueOf(int value) |
| 54 | + { |
| 55 | + return new ThreadCount(value); |
| 56 | + } |
| 57 | + |
| 58 | + public static ThreadCount valueOf(String value) |
| 59 | + { |
| 60 | + if (value.endsWith(PER_CORE_SUFFIX)) { |
| 61 | + float parsedMultiplier = parseFloat(value.substring(0, value.lastIndexOf(PER_CORE_SUFFIX)).trim()); |
| 62 | + checkArgument(parsedMultiplier > 0, "Thread multiplier cannot be negative"); |
| 63 | + float threadCount = parsedMultiplier * AVAILABLE_PROCESSORS.get(); |
| 64 | + checkArgument(threadCount <= Integer.MAX_VALUE, "Thread count is greater than 2^32 - 1"); |
| 65 | + return new ThreadCount(round(threadCount)); |
| 66 | + } |
| 67 | + |
| 68 | + return new ThreadCount(parseInteger(value)); |
| 69 | + } |
| 70 | + |
| 71 | + public static ThreadCount boundedValueOf(String value, String minValue, String maxValue) |
| 72 | + { |
| 73 | + ThreadCount parsed = ThreadCount.valueOf(value); |
| 74 | + ThreadCount min = ThreadCount.valueOf(minValue); |
| 75 | + ThreadCount max = ThreadCount.valueOf(maxValue); |
| 76 | + |
| 77 | + if (parsed.compareTo(min) < 0) { |
| 78 | + return min; |
| 79 | + } |
| 80 | + |
| 81 | + if (parsed.compareTo(max) > 0) { |
| 82 | + return max; |
| 83 | + } |
| 84 | + return parsed; |
| 85 | + } |
| 86 | + |
| 87 | + private static float parseFloat(String value) |
| 88 | + { |
| 89 | + try { |
| 90 | + return Float.parseFloat(value); |
| 91 | + } |
| 92 | + catch (NumberFormatException e) { |
| 93 | + throw new IllegalArgumentException(format("Cannot parse value '%s' as float", value), e); |
| 94 | + } |
| 95 | + } |
| 96 | + |
| 97 | + private static int parseInteger(String value) |
| 98 | + { |
| 99 | + try { |
| 100 | + long parsed = Long.parseLong(value); |
| 101 | + checkArgument(parsed <= Integer.MAX_VALUE, "Thread count is greater than 2^32 - 1"); |
| 102 | + return toIntExact(parsed); |
| 103 | + } |
| 104 | + catch (NumberFormatException e) { |
| 105 | + throw new IllegalArgumentException(format("Cannot parse value '%s' as integer", value), e); |
| 106 | + } |
| 107 | + } |
| 108 | + |
| 109 | + @Override |
| 110 | + public int compareTo(ThreadCount o) |
| 111 | + { |
| 112 | + return Integer.compare(threadCount, o.threadCount); |
| 113 | + } |
| 114 | + |
| 115 | + @Override |
| 116 | + public boolean equals(Object o) |
| 117 | + { |
| 118 | + if (this == o) { |
| 119 | + return true; |
| 120 | + } |
| 121 | + if (o == null || getClass() != o.getClass()) { |
| 122 | + return false; |
| 123 | + } |
| 124 | + |
| 125 | + ThreadCount that = (ThreadCount) o; |
| 126 | + return threadCount == that.threadCount; |
| 127 | + } |
| 128 | + |
| 129 | + @Override |
| 130 | + public int hashCode() |
| 131 | + { |
| 132 | + return threadCount; |
| 133 | + } |
| 134 | + |
| 135 | + @Override |
| 136 | + public String toString() |
| 137 | + { |
| 138 | + return (threadCount == 1) ? "1 thread" : (threadCount + " threads"); |
| 139 | + } |
| 140 | + |
| 141 | + static final class MachineInfo |
| 142 | + { |
| 143 | + private static final Path CPU_INFO_PATH = Paths.get("/proc/cpuinfo"); |
| 144 | + |
| 145 | + // cache physical processor count, so that it's not queried multiple times during tests |
| 146 | + private static volatile int physicalProcessorCount = -1; |
| 147 | + |
| 148 | + private MachineInfo() {} |
| 149 | + |
| 150 | + public static int getAvailablePhysicalProcessorCount() |
| 151 | + { |
| 152 | + if (physicalProcessorCount != -1) { |
| 153 | + return physicalProcessorCount; |
| 154 | + } |
| 155 | + |
| 156 | + String osArch = System.getProperty("os.arch"); |
| 157 | + // logical core count (including container cpu quota if there is any) |
| 158 | + int availableProcessorCount = Runtime.getRuntime().availableProcessors(); |
| 159 | + int totalPhysicalProcessorCount = availableProcessorCount; |
| 160 | + if ("amd64".equals(osArch) || "x86_64".equals(osArch)) { |
| 161 | + OptionalInt procInfo = tryReadFromProcCpuinfo(); |
| 162 | + if (procInfo.isPresent()) { |
| 163 | + totalPhysicalProcessorCount = procInfo.getAsInt(); |
| 164 | + } |
| 165 | + } |
| 166 | + |
| 167 | + // cap available processor count to container cpu quota (if there is any). |
| 168 | + physicalProcessorCount = min(totalPhysicalProcessorCount, availableProcessorCount); |
| 169 | + return physicalProcessorCount; |
| 170 | + } |
| 171 | + |
| 172 | + private static OptionalInt tryReadFromProcCpuinfo() |
| 173 | + { |
| 174 | + if (!exists(CPU_INFO_PATH)) { |
| 175 | + return OptionalInt.empty(); |
| 176 | + } |
| 177 | + |
| 178 | + try (Stream<String> lines = lines(CPU_INFO_PATH)) { |
| 179 | + return OptionalInt.of(toIntExact(lines.filter(line -> |
| 180 | + line.matches("^processor\\s+: \\d")).count())); |
| 181 | + } |
| 182 | + catch (IOException e) { |
| 183 | + return OptionalInt.empty(); |
| 184 | + } |
| 185 | + } |
| 186 | + } |
| 187 | +} |
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