1 files changed, 131 insertions, 0 deletions
diff --git a/vespajlib/src/test/java/ai/vespa/util/http/hc4/retry/DelayedResponseLevelRetryHandlerTest.java b/vespajlib/src/test/java/ai/vespa/util/http/hc4/retry/DelayedResponseLevelRetryHandlerTest.java
new file mode 100644
index 00000000000..514eae56fe8
--- /dev/null
+++ b/vespajlib/src/test/java/ai/vespa/util/http/hc4/retry/DelayedResponseLevelRetryHandlerTest.java
@@ -0,0 +1,131 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package ai.vespa.util.http.hc4.retry;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.HttpVersion;
+import org.apache.http.client.protocol.HttpClientContext;
+import org.apache.http.message.BasicHttpResponse;
+import org.apache.http.message.BasicStatusLine;
+import org.junit.Test;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+/**
+ * @author bjorncs
+ */
+public class DelayedResponseLevelRetryHandlerTest {
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void retry_consumers_are_invoked() {
+        RetryConsumer<HttpResponse> retryConsumer = mock(RetryConsumer.class);
+        RetryFailedConsumer<HttpResponse> retryFailedConsumer = mock(RetryFailedConsumer.class);
+
+        Duration delay = Duration.ofSeconds(10);
+        int maxRetries = 5;
+
+        DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
+                .withFixedDelay(delay, maxRetries)
+                .onRetry(retryConsumer)
+                .onRetryFailed(retryFailedConsumer)
+                .build();
+
+        HttpResponse response = createResponse(HttpStatus.SC_SERVICE_UNAVAILABLE);
+        HttpClientContext ctx = new HttpClientContext();
+        int lastExecutionCount = maxRetries + 1;
+        for (int i = 1; i <= lastExecutionCount; i++) {
+            handler.retryRequest(response, i, ctx);
+        }
+
+        verify(retryFailedConsumer).onRetryFailed(response, lastExecutionCount, ctx);
+        for (int i = 1; i < lastExecutionCount; i++) {
+            verify(retryConsumer).onRetry(response, delay, i, ctx);
+        }
+    }
+
+    @Test
+    public void retry_with_fixed_delay_sleeps_for_expected_duration() {
+        Duration delay = Duration.ofSeconds(2);
+        int maxRetries = 2;
+
+        DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
+                .withFixedDelay(delay, maxRetries)
+                .build();
+
+        HttpResponse response = createResponse(HttpStatus.SC_SERVICE_UNAVAILABLE);
+        HttpClientContext ctx = new HttpClientContext();
+        int lastExecutionCount = maxRetries + 1;
+        for (int i = 1; i <= lastExecutionCount; i++) {
+            handler.retryRequest(response, i, ctx);
+            assertEquals(delay.toMillis(), handler.getRetryInterval());
+        }
+    }
+
+    @Test
+    public void retry_with_fixed_backoff_sleeps_for_expected_durations() {
+        Duration startDelay = Duration.ofMillis(500);
+        Duration maxDelay = Duration.ofSeconds(5);
+        int maxRetries = 10;
+
+        DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
+                .withExponentialBackoff(startDelay, maxDelay, maxRetries)
+                .build();
+
+        HttpResponse response = createResponse(HttpStatus.SC_SERVICE_UNAVAILABLE);
+        HttpClientContext ctx = new HttpClientContext();
+        int lastExecutionCount = maxRetries + 1;
+        List<Duration> expectedIntervals =
+                Arrays.asList(
+                        startDelay, Duration.ofSeconds(1), Duration.ofSeconds(2), Duration.ofSeconds(4),
+                        Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5),
+                        Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5));
+        for (int i = 1; i <= lastExecutionCount; i++) {
+            handler.retryRequest(response, i, ctx);
+            assertEquals(expectedIntervals.get(i-1).toMillis(), handler.getRetryInterval());
+        }
+    }
+
+    @Test
+    public void retries_for_listed_exceptions_until_max_retries_exceeded() {
+        int maxRetries = 2;
+
+        DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
+                .withFixedDelay(Duration.ofSeconds(2), maxRetries)
+                .retryForStatusCodes(Arrays.asList(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
+                .build();
+
+        HttpResponse response = createResponse(HttpStatus.SC_SERVICE_UNAVAILABLE);
+        HttpClientContext ctx = new HttpClientContext();
+        int lastExecutionCount = maxRetries + 1;
+        for (int i = 1; i < lastExecutionCount; i++) {
+            assertTrue(handler.retryRequest(response, i, ctx));
+        }
+        assertFalse(handler.retryRequest(response, lastExecutionCount, ctx));
+    }
+
+    @Test
+    public void does_not_retry_for_non_listed_exception() {
+        DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
+                .withFixedDelay(Duration.ofSeconds(2), 2)
+                .retryForStatusCodes(Arrays.asList(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
+                .build();
+
+        HttpResponse response = createResponse(HttpStatus.SC_OK);
+        HttpClientContext ctx = new HttpClientContext();
+        assertFalse(handler.retryRequest(response, 1, ctx));
+    }
+
+    private static HttpResponse createResponse(int statusCode) {
+        return new BasicHttpResponse(new BasicStatusLine(HttpVersion.HTTP_1_1, statusCode, "reason phrase"));
+    }
+
+}