Update eviction threshold to nanoseconds and adjust related logic in ConfigFetcher

Author: novalisdenahi

src/main/java/com/configcat/ConfigFetcher.java

@@ -13,14 +13,14 @@ class ConfigFetcher implements Closeable {
 
     private static final long RETRY_DELAY_MS = 50;
 
-    private static final long EVICT_ALL_THRESHOLD_MS = 30000;
+    private static final long EVICT_ALL_THRESHOLD_NS = 30_000_000_000L; // 30 seconds in nanoseconds
 
     private final AtomicBoolean isClosed = new AtomicBoolean(false);
     private final ConfigCatLogger logger;
     private final OkHttpClient httpClient;
     private final String mode;
 
-    private long lastEvictAllTimestamp = 0;
+    private long lastEvictAllTimestamp = Long.MIN_VALUE;
 
     private final String sdkKey;
     private final boolean urlIsCustom;
@@ -182,8 +182,8 @@ private CompletableFuture<FetchResponse> fetchWithRetryAsync(final String eTag)
         return this.getResponseAsync(eTag).thenComposeAsync(response -> {
             if (response.shouldRetry()) {
                 try {
-                    long now = System.currentTimeMillis();
-                    if (lastEvictAllTimestamp == 0 || (now - lastEvictAllTimestamp) >= EVICT_ALL_THRESHOLD_MS) {
+                    long now = System.nanoTime();
+                    if (lastEvictAllTimestamp == Long.MIN_VALUE || (now - lastEvictAllTimestamp) >= EVICT_ALL_THRESHOLD_NS) {
                         this.httpClient.connectionPool().evictAll();
                         lastEvictAllTimestamp = now;
                     }

src/test/java/com/configcat/ConfigFetcherTest.java

@@ -430,7 +430,7 @@ public void evictAllThrottledWithin30Seconds() throws Exception {
                 "", this.server.url("/").toString(), false, PollingModes.manualPoll().getPollingIdentifier());
 
         // First fetch: evictAll should be called, timestamp set
-        assertEquals(0, getLastEvictAllTimestampWithReflection(fetcher));
+        assertEquals(Long.MIN_VALUE, getLastEvictAllTimestampWithReflection(fetcher));
         FetchResponse response1 = fetcher.fetchAsync(null).get();
         assertTrue(response1.isFetched());
         long firstTimestamp = getLastEvictAllTimestampWithReflection(fetcher);