com.google.caliper.runner.EnvironmentGetter.java Source code

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Here is the source code for com.google.caliper.runner.EnvironmentGetter.java

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/*
 * Copyright (C) 2010 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.caliper.runner;

import com.google.caliper.model.Host;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableMultiset;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.io.Files;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

/**
 * An instance of this class is responsible for returning a Map that describes the environment:
 * JVM version, os details, etc.
 */
final class EnvironmentGetter {
    Host getHost() {
        return new Host.Builder().addAllProperies(getProperties()).build();
    }

    private Map<String, String> getProperties() {
        TreeMap<String, String> propertyMap = Maps.newTreeMap();

        Map<String, String> sysProps = Maps.fromProperties(System.getProperties());

        // Sometimes java.runtime.version is more descriptive than java.version
        String version = sysProps.get("java.version");
        String alternateVersion = sysProps.get("java.runtime.version");
        if (alternateVersion != null && alternateVersion.length() > version.length()) {
            version = alternateVersion;
        }
        propertyMap.put("host.availableProcessors", Integer.toString(Runtime.getRuntime().availableProcessors()));

        String osName = sysProps.get("os.name");
        propertyMap.put("os.name", osName);
        propertyMap.put("os.version", sysProps.get("os.version"));
        propertyMap.put("os.arch", sysProps.get("os.arch"));

        if (osName.equals("Linux")) {
            getLinuxEnvironment(propertyMap);
        }

        return propertyMap;
    }

    private void getLinuxEnvironment(Map<String, String> propertyMap) {
        // the following probably doesn't work on ALL linux
        Multimap<String, String> cpuInfo = propertiesFromLinuxFile("/proc/cpuinfo");
        propertyMap.put("host.cpus", Integer.toString(cpuInfo.get("processor").size()));
        String s = "cpu cores";
        propertyMap.put("host.cpu.cores", describe(cpuInfo, s));
        propertyMap.put("host.cpu.names", describe(cpuInfo, "model name"));
        propertyMap.put("host.cpu.cachesize", describe(cpuInfo, "cache size"));

        Multimap<String, String> memInfo = propertiesFromLinuxFile("/proc/meminfo");
        // TODO redo memInfo.toString() so we don't get square brackets
        propertyMap.put("host.memory.physical", memInfo.get("MemTotal").toString());
        propertyMap.put("host.memory.swap", memInfo.get("SwapTotal").toString());
    }

    private static String describe(Multimap<String, String> cpuInfo, String s) {
        Collection<String> strings = cpuInfo.get(s);
        // TODO redo the ImmutableMultiset.toString() call so we don't get square brackets
        return (strings.size() == 1) ? strings.iterator().next() : ImmutableMultiset.copyOf(strings).toString();
    }

    /**
     * Returns the key/value pairs from the specified properties-file like file.
     * Unlike standard Java properties files, {@code reader} is allowed to list
     * the same property multiple times. Comments etc. are unsupported.
     *
     * <p>If there's any problem reading the file's contents, we'll return an
     * empty Multimap.
     */
    private static Multimap<String, String> propertiesFromLinuxFile(String file) {
        try {
            List<String> lines = Files.readLines(new File(file), Charset.defaultCharset());
            ImmutableMultimap.Builder<String, String> result = ImmutableMultimap.builder();
            for (String line : lines) {
                // TODO(schmoe): replace with Splitter (in Guava release 10)
                String[] parts = line.split("\\s*\\:\\s*", 2);
                if (parts.length == 2) {
                    result.put(parts[0], parts[1]);
                }
            }
            return result.build();
        } catch (IOException e) {
            // If there's any problem reading the file, just return an empty multimap.
            return ImmutableMultimap.of();
        }
    }
}