Source:
public FileMergeCacheManager( CacheConfig cacheConfig, FileMergeCacheConfig fileMergeCacheConfig, CacheStats stats, ExecutorService cacheFlushExecutor, ExecutorService cacheRemovalExecutor, ScheduledExecutorService cacheSizeCalculateExecutor) { requireNonNull(cacheConfig, "directory is null"); this.cacheFlushExecutor = cacheFlushExecutor; this.cacheRemovalExecutor = cacheRemovalExecutor; this.cacheSizeCalculateExecutor = cacheSizeCalculateExecutor; this.cache = CacheBuilder.newBuilder() .maximumSize(fileMergeCacheConfig.getMaxCachedEntries()) .expireAfterAccess(fileMergeCacheConfig.getCacheTtl().toMillis(), MILLISECONDS) .removalListener(new CacheRemovalListener()) .recordStats() .build(); this.stats = requireNonNull(stats, "stats is null"); this.baseDirectory = new Path(cacheConfig.getBaseDirectory()); checkArgument(fileMergeCacheConfig.getMaxInMemoryCacheSize().toBytes() >= 0, "maxInflightBytes is negative"); this.maxInflightBytes = fileMergeCacheConfig.getMaxInMemoryCacheSize().toBytes(); File target = new File(baseDirectory.toUri()); if (!target.exists()) { try { Files.createDirectories(target.toPath()); } catch (IOException e) { throw new PrestoException(GENERIC_INTERNAL_ERROR, "cannot create cache directory " + target, e); } } else { File[] files = target.listFiles(); if (files == null) { return; } this.cacheRemovalExecutor.submit(() -> Arrays.stream(files).forEach(file -> { try { Files.delete(file.toPath()); } catch (IOException e) { } })); } this.cacheSizeCalculateExecutor.schedule( () -> { cacheScopeFiles.keySet().forEach(cacheIdentifier -> cacheScopeSize.put(cacheIdentifier, getCacheScopeSizeInBytes(cacheIdentifier))); }, 1, TimeUnit.SECONDS); }

Target:
public FileMergeCacheManager( CacheConfig cacheConfig, FileMergeCacheConfig fileMergeCacheConfig, CacheStats stats, ExecutorService cacheFlushExecutor, ExecutorService cacheRemovalExecutor, ScheduledExecutorService cacheSizeCalculateExecutor) { requireNonNull(cacheConfig, "directory is null"); this.cacheFlushExecutor = cacheFlushExecutor; this.cacheRemovalExecutor = cacheRemovalExecutor; this.cacheSizeCalculateExecutor = cacheSizeCalculateExecutor; this.cache = CacheBuilder.newBuilder() .maximumSize(fileMergeCacheConfig.getMaxCachedEntries()) .expireAfterAccess(fileMergeCacheConfig.getCacheTtl().toMillis(), MILLISECONDS) .removalListener(new CacheRemovalListener()) .recordStats() .build(); this.stats = requireNonNull(stats, "stats is null"); this.baseDirectory = new Path(cacheConfig.getBaseDirectory()); checkArgument(fileMergeCacheConfig.getMaxInMemoryCacheSize().toBytes() >= 0, "maxInflightBytes is negative"); this.maxInflightBytes = fileMergeCacheConfig.getMaxInMemoryCacheSize().toBytes(); File target = new File(baseDirectory.toUri()); if (!target.exists()) { try { Files.createDirectories(target.toPath()); } catch (IOException e) { throw new PrestoException(GENERIC_INTERNAL_ERROR, "cannot create cache directory " + target, e); } } else { File[] files = target.listFiles(); if (files == null) { return; } this.cacheRemovalExecutor.submit(() -> Arrays.stream(files).forEach(file -> { try { Files.delete(file.toPath()); } catch (IOException e) { } })); } this.cacheSizeCalculateExecutor.scheduleAtFixedRate( () -> { cacheScopeFiles.keySet().forEach(cacheIdentifier -> cacheScopeSizeInBytes.put(cacheIdentifier, getCacheScopeSizeInBytes(cacheIdentifier))); cacheScopeSizeInBytes.keySet().removeIf(key -> !cacheScopeFiles.containsKey(key)); }, 0, 15, TimeUnit.SECONDS); }