Java CacheBuilder.maximumSize方法代码示例

import com.google.common.cache.CacheBuilder; //导入方法依赖的package包/类
/**
 * Construct a cache using the specified capacity and name.
 * 
 * @param maxItems The cache capacity. 0 = use {@link #DEFAULT_CAPACITY}
 * @param useMaxItems Whether the maxItems value should be applied as a size-cap for the cache.
 * @param cacheName An arbitrary cache name.
 */
@SuppressWarnings("unchecked")
public DefaultSimpleCache(int maxItems, boolean useMaxItems, int ttlSecs, int maxIdleSecs, String cacheName)
{
    if (maxItems == 0)
    {
        maxItems = DEFAULT_CAPACITY;
    }
    else if (maxItems < 0)
    {
        throw new IllegalArgumentException("maxItems may not be negative, but was " + maxItems);
    }
    this.maxItems = maxItems;
    this.useMaxItems = useMaxItems;
    this.ttlSecs = ttlSecs;
    this.maxIdleSecs = maxIdleSecs;
    setBeanName(cacheName);
    
    // The map will have a bounded size determined by the maxItems member variable.
    @SuppressWarnings("rawtypes")
    CacheBuilder builder = CacheBuilder.newBuilder();
    
    if (useMaxItems)
    {
        builder.maximumSize(maxItems);
    }
    if (ttlSecs > 0)
    {
        builder.expireAfterWrite(ttlSecs, TimeUnit.SECONDS);
    }
    if (maxIdleSecs > 0)
    {
        builder.expireAfterAccess(maxIdleSecs, TimeUnit.SECONDS);
    }
    builder.concurrencyLevel(32);
    
    cache = (Cache<K, AbstractMap.SimpleImmutableEntry<K, V>>) builder.build();
}
 

import com.google.common.cache.CacheBuilder; //导入方法依赖的package包/类
@Inject
public ScriptService(Settings settings, Environment env, Set<ScriptEngineService> scriptEngines,
                     ResourceWatcherService resourceWatcherService, ScriptContextRegistry scriptContextRegistry) throws IOException {
    super(settings);
    this.parseFieldMatcher = new ParseFieldMatcher(settings);
    if (Strings.hasLength(settings.get(DISABLE_DYNAMIC_SCRIPTING_SETTING))) {
        throw new IllegalArgumentException(DISABLE_DYNAMIC_SCRIPTING_SETTING + " is not a supported setting, replace with fine-grained script settings. \n" +
                "Dynamic scripts can be enabled for all languages and all operations by replacing `script.disable_dynamic: false` with `script.inline: on` and `script.indexed: on` in elasticsearch.yml");
    }

    this.scriptEngines = scriptEngines;
    this.scriptContextRegistry = scriptContextRegistry;
    int cacheMaxSize = settings.getAsInt(SCRIPT_CACHE_SIZE_SETTING, SCRIPT_CACHE_SIZE_DEFAULT);
    TimeValue cacheExpire = settings.getAsTime(SCRIPT_CACHE_EXPIRE_SETTING, null);
    logger.debug("using script cache with max_size [{}], expire [{}]", cacheMaxSize, cacheExpire);

    this.defaultLang = settings.get(DEFAULT_SCRIPTING_LANGUAGE_SETTING, DEFAULT_LANG);

    CacheBuilder cacheBuilder = CacheBuilder.newBuilder();
    if (cacheMaxSize >= 0) {
        cacheBuilder.maximumSize(cacheMaxSize);
    }
    if (cacheExpire != null) {
        cacheBuilder.expireAfterAccess(cacheExpire.nanos(), TimeUnit.NANOSECONDS);
    }
    this.cache = cacheBuilder.removalListener(new ScriptCacheRemovalListener()).build();

    ImmutableMap.Builder<String, ScriptEngineService> enginesByLangBuilder = ImmutableMap.builder();
    ImmutableMap.Builder<String, ScriptEngineService> enginesByExtBuilder = ImmutableMap.builder();
    for (ScriptEngineService scriptEngine : scriptEngines) {
        for (String type : scriptEngine.types()) {
            enginesByLangBuilder.put(type, scriptEngine);
        }
        for (String ext : scriptEngine.extensions()) {
            enginesByExtBuilder.put(ext, scriptEngine);
        }
    }
    this.scriptEnginesByLang = enginesByLangBuilder.build();
    this.scriptEnginesByExt = enginesByExtBuilder.build();

    this.scriptModes = new ScriptModes(this.scriptEnginesByLang, scriptContextRegistry, settings);

    // add file watcher for static scripts
    scriptsDirectory = env.scriptsFile();
    if (logger.isTraceEnabled()) {
        logger.trace("Using scripts directory [{}] ", scriptsDirectory);
    }
    FileWatcher fileWatcher = new FileWatcher(scriptsDirectory);
    fileWatcher.addListener(new ScriptChangesListener());

    if (settings.getAsBoolean(SCRIPT_AUTO_RELOAD_ENABLED_SETTING, true)) {
        // automatic reload is enabled - register scripts
        resourceWatcherService.add(fileWatcher);
    } else {
        // automatic reload is disable just load scripts once
        fileWatcher.init();
    }
}