Reduce useless io calls

sentry-android-core/src/main/java/io/sentry/android/core/cache/AndroidEnvelopeCache.java

@@ -19,6 +19,7 @@
 import io.sentry.util.HintUtils;
 import io.sentry.util.Objects;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.OutputStream;
 import org.jetbrains.annotations.ApiStatus;
@@ -146,22 +147,25 @@ public static boolean hasStartupCrashMarker(final @NotNull SentryOptions options
 
     final File lastAnrMarker = new File(cacheDirPath, LAST_ANR_REPORT);
     try {
-      if (lastAnrMarker.exists() && lastAnrMarker.canRead()) {
-        final String content = FileUtils.readText(lastAnrMarker);
-        // we wrapped into try-catch already
-        //noinspection ConstantConditions
-        return content.equals("null") ? null : Long.parseLong(content.trim());
-      } else {
+      final String content = FileUtils.readText(lastAnrMarker);
+      // we wrapped into try-catch already
+      //noinspection ConstantConditions
+      return content.equals("null") ? null : Long.parseLong(content.trim());
+    } catch (Throwable e) {
+      final char[] buf = new char[64];
+      new String(buf, 0, 0);
+      if (e instanceof FileNotFoundException) {
         options
             .getLogger()
             .log(DEBUG, "Last ANR marker does not exist. %s.", lastAnrMarker.getAbsolutePath());
+      } else {
+        options.getLogger().log(ERROR, "Error reading last ANR marker", e);
       }
-    } catch (Throwable e) {
-      options.getLogger().log(ERROR, "Error reading last ANR marker", e);
     }
     return null;
   }
 
+  @TestOnly
   private void writeLastReportedAnrMarker(final @Nullable Long timestamp) {
     final String cacheDirPath = options.getCacheDirPath();
     if (cacheDirPath == null) {

sentry-android-core/src/main/java/io/sentry/android/core/internal/util/CpuInfoUtils.java

@@ -51,8 +51,6 @@ private CpuInfoUtils() {}
         if (!cpuDir.getName().matches("cpu[0-9]+")) continue;
         File cpuMaxFreqFile = new File(cpuDir, CPUINFO_MAX_FREQ_PATH);
 
-        if (!cpuMaxFreqFile.exists() || !cpuMaxFreqFile.canRead()) continue;
-
         long khz;
         try {
           String content = FileUtils.readText(cpuMaxFreqFile);

sentry/src/main/java/io/sentry/DirectoryProcessor.java

@@ -40,34 +40,19 @@ public void processDirectory(final @NotNull File directory) {
     try {
       logger.log(SentryLevel.DEBUG, "Processing dir. %s", directory.getAbsolutePath());
 
-      if (!directory.exists()) {
-        logger.log(
-            SentryLevel.WARNING,
-            "Directory '%s' doesn't exist. No cached events to send.",
-            directory.getAbsolutePath());
-        return;
-      }
-      if (!directory.isDirectory()) {
-        logger.log(
-            SentryLevel.ERROR, "Cache dir %s is not a directory.", directory.getAbsolutePath());
-        return;
-      }
-
-      final File[] listFiles = directory.listFiles();
-      if (listFiles == null) {
+      final File[] filteredListFiles = directory.listFiles((d, name) -> isRelevantFileName(name));
+      if (filteredListFiles == null) {
         logger.log(SentryLevel.ERROR, "Cache dir %s is null.", directory.getAbsolutePath());
         return;
       }
 
-      final File[] filteredListFiles = directory.listFiles((d, name) -> isRelevantFileName(name));
-
       logger.log(
           SentryLevel.DEBUG,
           "Processing %d items from cache dir %s",
-          filteredListFiles != null ? filteredListFiles.length : 0,
+          filteredListFiles.length,
           directory.getAbsolutePath());
 
-      for (File file : listFiles) {
+      for (File file : filteredListFiles) {
         // it ignores .sentry-native database folder and new ones that might come up
         if (!file.isFile()) {
           logger.log(SentryLevel.DEBUG, "File %s is not a File.", file.getAbsolutePath());

sentry/src/main/java/io/sentry/cache/EnvelopeCache.java

@@ -340,18 +340,17 @@ public void discard(final @NotNull SentryEnvelope envelope) {
     Objects.requireNonNull(envelope, "Envelope is required.");
 
     final File envelopeFile = getEnvelopeFile(envelope);
-    if (envelopeFile.exists()) {
+    if (envelopeFile.delete()) {
       options
           .getLogger()
           .log(DEBUG, "Discarding envelope from cache: %s", envelopeFile.getAbsolutePath());
-
-      if (!envelopeFile.delete()) {
-        options
-            .getLogger()
-            .log(ERROR, "Failed to delete envelope: %s", envelopeFile.getAbsolutePath());
-      }
     } else {
-      options.getLogger().log(DEBUG, "Envelope was not cached: %s", envelopeFile.getAbsolutePath());
+      options
+          .getLogger()
+          .log(
+              DEBUG,
+              "Envelope was not cached or could not be deleted: %s",
+              envelopeFile.getAbsolutePath());
     }
   }