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#1664 Add a cache to avoid checking filesystem too often (might be slow) - save result to hidden file

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This commit is contained in:
Sean Mac Gillicuddy 2020-09-10 12:05:30 +01:00
parent 01a6f186b1
commit adeb6ee2ca
1 changed files with 22 additions and 4 deletions
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24
app/src/main/java/org/kiwix/kiwixmobile/zim_manager/FileWritingFileSystemChecker.kt
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@ -21,27 +21,45 @@ package org.kiwix.kiwixmobile.zim_manager
import android.util.Log import android.util.Log
import org.kiwix.kiwixmobile.zim_manager.FileSystemCapability.CANNOT_WRITE_4GB import org.kiwix.kiwixmobile.zim_manager.FileSystemCapability.CANNOT_WRITE_4GB
import org.kiwix.kiwixmobile.zim_manager.FileSystemCapability.CAN_WRITE_4GB import org.kiwix.kiwixmobile.zim_manager.FileSystemCapability.CAN_WRITE_4GB
import org.kiwix.kiwixmobile.zim_manager.FileSystemCapability.INCONCLUSIVE
import java.io.File import java.io.File
import java.io.RandomAccessFile import java.io.RandomAccessFile
class FileWritingFileSystemChecker : FileSystemChecker { class FileWritingFileSystemChecker : FileSystemChecker {
override fun checkFilesystemSupports4GbFiles(path: String): FileSystemCapability { override fun checkFilesystemSupports4GbFiles(path: String): FileSystemCapability {
with(File("$path/large_file_test.txt")) { val resultFile = File("$path/.file_writing_result")
if (resultFile.exists()) {
when (val capability = readCapability(resultFile)) {
CAN_WRITE_4GB,
CANNOT_WRITE_4GB -> return capability
}
}
return with(File("$path/large_file_test.txt"), {
deleteIfExists() deleteIfExists()
try { try {
RandomAccessFile(this.path, "rw").use { RandomAccessFile(this.path, "rw").use {
it.setLength(Fat32Checker.FOUR_GIGABYTES_IN_BYTES) it.setLength(Fat32Checker.FOUR_GIGABYTES_IN_BYTES)
return@checkFilesystemSupports4GbFiles CAN_WRITE_4GB CAN_WRITE_4GB.alsoSaveTo(resultFile)
} }
} catch (e: Exception) { } catch (e: Exception) {
e.printStackTrace() e.printStackTrace()
Log.d("Fat32Checker", e.message) Log.d("Fat32Checker", e.message)
return@checkFilesystemSupports4GbFiles CANNOT_WRITE_4GB CANNOT_WRITE_4GB.alsoSaveTo(resultFile)
} finally { } finally {
deleteIfExists() deleteIfExists()
} }
})
} }
private fun readCapability(resultFile: File) =
try {
FileSystemCapability.valueOf(resultFile.readText())
} catch (illegalArgumentException: IllegalArgumentException) {
INCONCLUSIVE
} }
private fun FileSystemCapability.alsoSaveTo(resultFile: File) =
also { resultFile.writeText(name) }
} }
private fun File.deleteIfExists() { private fun File.deleteIfExists() {