sample: Configure polling algorithm in long recognition sample (#464)

Author: baeminbo

speech/snippets/src/main/java/com/example/speech/Recognize.java

@@ -17,6 +17,9 @@
 package com.example.speech;
 
 import com.google.api.gax.longrunning.OperationFuture;
+import com.google.api.gax.longrunning.OperationTimedPollAlgorithm;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.retrying.TimedRetryAlgorithm;
 import com.google.api.gax.rpc.ApiStreamObserver;
 import com.google.api.gax.rpc.BidiStreamingCallable;
 import com.google.api.gax.rpc.ClientStream;
@@ -31,6 +34,7 @@
 import com.google.cloud.speech.v1.SpeechClient;
 import com.google.cloud.speech.v1.SpeechRecognitionAlternative;
 import com.google.cloud.speech.v1.SpeechRecognitionResult;
+import com.google.cloud.speech.v1.SpeechSettings;
 import com.google.cloud.speech.v1.StreamingRecognitionConfig;
 import com.google.cloud.speech.v1.StreamingRecognitionResult;
 import com.google.cloud.speech.v1.StreamingRecognizeRequest;
@@ -50,6 +54,7 @@
 import javax.sound.sampled.DataLine;
 import javax.sound.sampled.DataLine.Info;
 import javax.sound.sampled.TargetDataLine;
+import org.threeten.bp.Duration;
 
 public class Recognize {
 
@@ -331,8 +336,22 @@ public static void asyncRecognizeWords(String gcsUri) throws Exception {
    * @param gcsUri the path to the remote LINEAR16 audio file to transcribe.
    */
   public static void asyncRecognizeGcs(String gcsUri) throws Exception {
+    // Configure polling algorithm
+    SpeechSettings.Builder speechSettings = SpeechSettings.newBuilder();
+    TimedRetryAlgorithm timedRetryAlgorithm = OperationTimedPollAlgorithm.create(
+        RetrySettings.newBuilder()
+            .setInitialRetryDelay(Duration.ofMillis(500L))
+            .setRetryDelayMultiplier(1.5)
+            .setMaxRetryDelay(Duration.ofMillis(5000L))
+            .setInitialRpcTimeout(Duration.ZERO) // ignored
+            .setRpcTimeoutMultiplier(1.0) // ignored
+            .setMaxRpcTimeout(Duration.ZERO) // ignored
+            .setTotalTimeout(Duration.ofHours(24L))  // set polling timeout to 24 hours
+            .build());
+    speechSettings.longRunningRecognizeOperationSettings().setPollingAlgorithm(timedRetryAlgorithm);
+
     // Instantiates a client with GOOGLE_APPLICATION_CREDENTIALS
-    try (SpeechClient speech = SpeechClient.create()) {
+    try (SpeechClient speech = SpeechClient.create(speechSettings.build())) {
 
       // Configure remote file request for FLAC
       RecognitionConfig config =