// ReadFile reads the given file in the file tree corresponding to revision rev.
	// It should refuse to read more than maxSize bytes.
	//
	// If the requested file does not exist it should return an error for which
	// os.IsNotExist(err) returns true.
	ReadFile(ctx context.Context, rev, file string, maxSize int64) (data []byte, err error)

	// ReadZip downloads a zip file for the subdir subdirectory

  private val toClose = ArrayDeque<DiskLruCache>()

  private fun createNewCache() {
    createNewCacheWithSize(Int.MAX_VALUE)
  }

  private fun createNewCacheWithSize(maxSize: Int) {
    cache =
      DiskLruCache(filesystem, cacheDir, appVersion, 2, maxSize.toLong(), taskRunner).also {
        toClose.add(it)
      }
    synchronized(cache) { cache.initialize() }
  }

  fun setUp(
    baseFilesystem: FileSystem,

        getOnly = false,
      )
    runBatch(dnsProviders, names)
    val dnsCache =
      Cache(
        directory = File("./target/TestDohMain.cache.${System.currentTimeMillis()}"),
        maxSize = 10L * 1024 * 1024,
      )
    println("Bad targets\n***********\n")
    val url = "https://dns.cloudflare.com/.not-so-well-known/run-dmc-query".toHttpUrl()
    val badProviders =
      listOf(

        if not ca_certs:
            ca_certs = certifi.where()

        self._http = urllib3.PoolManager(
            timeout=urllib3.Timeout.DEFAULT_TIMEOUT,
            maxsize=10,
            cert_reqs='CERT_NONE',
            ca_certs=ca_certs,
            retries=urllib3.Retry(
                total=5,
                backoff_factor=0.2,
                status_forcelist=[500, 502, 503, 504]

		"--admission-control-config-file=/admission-control-config",
		"--advertise-address=192.168.10.10",
		"--anonymous-auth=false",
		"--audit-log-maxage=11",
		"--audit-log-maxbackup=12",
		"--audit-log-maxsize=13",
		"--audit-log-path=/var/log",
		"--audit-log-mode=blocking",
		"--audit-log-batch-buffer-size=46",
		"--audit-log-batch-max-size=47",
		"--audit-log-batch-max-wait=48s",
		"--audit-log-batch-throttle-enable=true",

	DISPATCH(runtime·call1073741824, 1073741824)
	MOVD	$runtime·badreflectcall(SB), R5
	BR	(R5)

#define CALLFN(NAME,MAXSIZE)			\
TEXT NAME(SB), WRAPPER, $MAXSIZE-48;		\
	NO_LOCAL_POINTERS;			\
	/* copy arguments to stack */		\
	MOVD	stackArgs+16(FP), R4;			\
	MOVWZ	stackArgsSize+24(FP), R5;		\
	MOVD	$stack-MAXSIZE(SP), R6;		\
loopArgs: /* copy 256 bytes at a time */	\
	CMP	R5, $256;			\
	BLT	tailArgs;			\
	SUB	$256, R5;			\

            doColumn("createdBy");
        }

        public void columnCreatedTime() {
            doColumn("createdTime");
        }

        public void columnMaxSize() {
            doColumn("maxSize");
        }

        public void columnQuery() {
            doColumn("query");
        }

        public void columnTerm() {
            doColumn("term");
        }

```kotlin
  private val client: OkHttpClient = OkHttpClient.Builder()
      .cache(Cache(
          directory = File(application.cacheDir, "http_cache"),
          // $0.05 worth of phone storage in 2020
          maxSize = 50L * 1024L * 1024L // 50 MiB
      ))
      .build()
```

## EventListener events 

Cache Events are exposed via the EventListener API.  Typical scenarios are below.

### Cache Hit

		"--advertise-address=192.168.10.10",
		"--allow-privileged=false",
		"--anonymous-auth=false",
		"--apiserver-count=5",
		"--audit-log-maxage=11",
		"--audit-log-maxbackup=12",
		"--audit-log-maxsize=13",
		"--audit-log-path=/var/log",
		"--audit-log-mode=blocking",
		"--audit-log-batch-buffer-size=46",
		"--audit-log-batch-max-size=47",
		"--audit-log-batch-max-wait=48s",
		"--audit-log-batch-throttle-enable=true",

	return info, nil
}

func (r *vcsRepo) Latest(ctx context.Context) (*RevInfo, error) {
	return r.Stat(ctx, "latest")
}

func (r *vcsRepo) ReadFile(ctx context.Context, rev, file string, maxSize int64) ([]byte, error) {
	if rev == "latest" {
		rev = r.cmd.latest
	}
	_, err := r.Stat(ctx, rev) // download rev into local repo
	if err != nil {
		return nil, err
	}