Fix checkstyle issues in com.fauna.client

src/main/java/com/fauna/client/BaseFaunaClient.java

@@ -24,8 +24,8 @@ public final class BaseFaunaClient extends FaunaClient {
      * @param httpClient    A Java HTTP client instance.
      * @param retryStrategy An implementation of RetryStrategy.
      */
-    public BaseFaunaClient(FaunaConfig faunaConfig,
-                           HttpClient httpClient, RetryStrategy retryStrategy) {
+    public BaseFaunaClient(final FaunaConfig faunaConfig,
+                           final HttpClient httpClient, final RetryStrategy retryStrategy) {
         super(faunaConfig.getSecret(), faunaConfig.getLogHandler(),
                 faunaConfig.getStatsCollector());
         this.httpClient = httpClient;
@@ -52,7 +52,7 @@ public BaseFaunaClient(FaunaConfig faunaConfig,
      *
      * @param faunaConfig The Fauna configuration settings.
      */
-    public BaseFaunaClient(FaunaConfig faunaConfig) {
+    public BaseFaunaClient(final FaunaConfig faunaConfig) {
         this(faunaConfig, HttpClient.newBuilder().build(),
                 DEFAULT_RETRY_STRATEGY);
     }

src/main/java/com/fauna/client/ExponentialBackoffStrategy.java

@@ -1,88 +1,77 @@
 package com.fauna.client;
 
-
-public class ExponentialBackoffStrategy implements RetryStrategy {
+/**
+ * Implements an exponential backoff strategy for retries.
+ * The backoff delay increases exponentially with each retry attempt, with optional jitter.
+ */
+public final class ExponentialBackoffStrategy implements RetryStrategy {
     private final float backoffFactor;
     private final int maxAttempts;
     private final int initialIntervalMillis;
     private final int maxBackoffMillis;
     private final float jitterFactor;
 
     /**
-     * Construct an Exponential backoff strategy.
-     * The basic formula for exponential backoff is `b^(a-1)` where `b` is the backoff factor, and `a` is the retry
-     * attempt number. So for a backoff factor of 2, you get:
-     * 2^0=1, 2^1=2, 2^3=4, 2^4=8 ...
+     * Constructs an Exponential backoff strategy.
      *
-     * @param maxAttempts           The maximum amount of retry attempts. Defaults to 3 retry attempts which means
-     *                              the client will make a total of 4 requests before giving up.
-     * @param backoffFactor         Defines how quickly the client will back off, default is 2.
-     *                              A value of 1 would not backoff (not recommended).
-     * @param initialIntervalMillis Defines the interval for the first wait. Default is 1000ms.
-     * @param maxBackoffMillis      Set a cap on the delay between requests. The default is 20,000ms
-     * @param jitterFactor          A value between 0 (0%) and 1 (100%) that controls how much to jitter the delay.
-     *                              The default is 0.5.
+     * @param maxAttempts           The maximum number of retry attempts. Defaults to 3 retries.
+     * @param backoffFactor         The factor by which the delay will increase. Default is 2.
+     * @param initialIntervalMillis The interval (in milliseconds) for the first retry attempt. Default is 1000ms.
+     * @param maxBackoffMillis      The maximum delay (in milliseconds) between retries. Default is 20000ms.
+     * @param jitterFactor          A value between 0 and 1 that controls the jitter factor. Default is 0.5.
      */
-    ExponentialBackoffStrategy(int maxAttempts, float backoffFactor,
-                               int initialIntervalMillis,
-                               int maxBackoffMillis, float jitterFactor) {
+    ExponentialBackoffStrategy(final int maxAttempts, final float backoffFactor,
+                               final int initialIntervalMillis,
+                               final int maxBackoffMillis, final float jitterFactor) {
         this.maxAttempts = maxAttempts;
         this.backoffFactor = backoffFactor;
         this.initialIntervalMillis = initialIntervalMillis;
         this.maxBackoffMillis = maxBackoffMillis;
         this.jitterFactor = jitterFactor;
+
         if (jitterFactor < 0.0 || jitterFactor > 1.0) {
-            throw new IllegalArgumentException(
-                    "Jitter factor must be between 0 and 1.");
+            throw new IllegalArgumentException("Jitter factor must be between 0 and 1.");
         }
         if (backoffFactor < 0.0) {
-            throw new IllegalArgumentException(
-                    "Backoff factor must be positive.");
+            throw new IllegalArgumentException("Backoff factor must be positive.");
         }
         if (maxAttempts < 0) {
-            throw new IllegalArgumentException(
-                    "Max attempts must be a natural number (not negative).");
+            throw new IllegalArgumentException("Max attempts must be a natural number (not negative).");
         }
         if (initialIntervalMillis < 0) {
-            throw new IllegalArgumentException(
-                    "Initial interval must be positive.");
+            throw new IllegalArgumentException("Initial interval must be positive.");
         }
         if (maxBackoffMillis < 0) {
             throw new IllegalArgumentException("Max backoff must be positive.");
         }
     }
 
     /**
-     * Get the % to jitter the backoff, will be a value between 0 and jitterFactor.
+     * Generates a random jitter percent between 0 and the jitterFactor.
      *
-     * @return A randomly generated value between 0 and jitterFactor.
+     * @return A random jitter percent.
      */
     private double getJitterPercent() {
         return Math.random() * jitterFactor;
     }
 
     @Override
-    public boolean canRetry(int retryAttempt) {
+    public boolean canRetry(final int retryAttempt) {
         if (retryAttempt < 0) {
-            throw new IllegalArgumentException(
-                    "Retry attempt must be a natural number (not negative).");
+            throw new IllegalArgumentException("Retry attempt must be a natural number (not negative).");
         }
         return retryAttempt <= maxAttempts;
     }
 
     @Override
-    public int getDelayMillis(int retryAttempt) {
+    public int getDelayMillis(final int retryAttempt) {
         if (retryAttempt < 0) {
-            throw new IllegalArgumentException(
-                    "Retry attempt must be a natural number (not negative).");
+            throw new IllegalArgumentException("Retry attempt must be a natural number (not negative).");
         } else if (retryAttempt == 0) {
             return 0;
         } else {
-            double deterministicBackoff =
-                    Math.pow(this.backoffFactor, retryAttempt - 1);
-            double calculatedBackoff =
-                    deterministicBackoff * (1 - getJitterPercent()) *
-                            initialIntervalMillis;
+            double deterministicBackoff = Math.pow(this.backoffFactor, retryAttempt - 1);
+            double calculatedBackoff = deterministicBackoff * (1 - getJitterPercent()) * initialIntervalMillis;
             return (int) Math.min(calculatedBackoff, this.maxBackoffMillis);
         }
     }
@@ -92,47 +81,77 @@ public int getMaxRetryAttempts() {
         return this.maxAttempts;
     }
 
-
     /**
-     * Build a new ExponentialBackoffStrategy. This builder only supports setting maxAttempts, because that's the only
-     * variable that we recommend users change in production. If you need to modify other values for debugging, or other
-     * purposes, then you can use the constructor directly.
+     * Builder class for the ExponentialBackoffStrategy.
+     * Allows fluent configuration of the backoff strategy parameters.
      */
     public static class Builder {
         private float backoffFactor = 2.0f;
-                // Results in delay of 1, 2, 4, 8, 16... seconds.
-        private int maxAttempts = 3;     // Limits number of retry attempts.
+        private int maxAttempts = 3;
         private int initialIntervalMillis = 1000;
         private int maxBackoffMillis = 20_000;
-        // A jitterFactor of 0.5, combined with a backoffFactor of 2 ensures that the delay is always increasing.
         private float jitterFactor = 0.5f;
 
-
-        public Builder maxAttempts(int maxAttempts) {
+        /**
+         * Sets the maximum number of retry attempts.
+         *
+         * @param maxAttempts The maximum number of retry attempts.
+         * @return The current Builder instance.
+         */
+        public Builder maxAttempts(final int maxAttempts) {
             this.maxAttempts = maxAttempts;
             return this;
         }
 
-        public Builder backoffFactor(float backoffFactor) {
+        /**
+         * Sets the backoff factor.
+         *
+         * @param backoffFactor The factor by which the backoff delay increases.
+         * @return The current Builder instance.
+         */
+        public Builder backoffFactor(final float backoffFactor) {
             this.backoffFactor = backoffFactor;
             return this;
         }
 
-        public Builder initialIntervalMillis(int initialIntervalMillis) {
+        /**
+         * Sets the initial interval (in milliseconds) for the first retry attempt.
+         *
+         * @param initialIntervalMillis The initial interval in milliseconds.
+         * @return The current Builder instance.
+         */
+        public Builder initialIntervalMillis(final int initialIntervalMillis) {
             this.initialIntervalMillis = initialIntervalMillis;
             return this;
         }
 
-        public Builder maxBackoffMillis(int maxBackoffMillis) {
+        /**
+         * Sets the maximum backoff (in milliseconds) between retries.
+         *
+         * @param maxBackoffMillis The maximum backoff in milliseconds.
+         * @return The current Builder instance.
+         */
+        public Builder maxBackoffMillis(final int maxBackoffMillis) {
             this.maxBackoffMillis = maxBackoffMillis;
             return this;
         }
 
-        public Builder jitterFactor(float jitterFactor) {
+        /**
+         * Sets the jitter factor (between 0 and 1) to control how much to jitter the backoff delay.
+         *
+         * @param jitterFactor The jitter factor.
+         * @return The current Builder instance.
+         */
+        public Builder jitterFactor(final float jitterFactor) {
             this.jitterFactor = jitterFactor;
             return this;
         }
 
+        /**
+         * Builds and returns a new ExponentialBackoffStrategy instance.
+         *
+         * @return A new ExponentialBackoffStrategy.
+         */
         public ExponentialBackoffStrategy build() {
             return new ExponentialBackoffStrategy(
                     this.maxAttempts, this.backoffFactor,
@@ -141,6 +160,11 @@ public ExponentialBackoffStrategy build() {
         }
     }
 
+    /**
+     * Creates a new Builder instance for ExponentialBackoffStrategy.
+     *
+     * @return A new Builder instance.
+     */
     public static Builder builder() {
         return new Builder();
     }

src/main/java/com/fauna/client/Fauna.java

@@ -2,7 +2,10 @@
 
 import java.net.http.HttpClient;
 
-public class Fauna {
+public final class Fauna {
+
+    private Fauna() {
+    }
 
     /**
      * Create a default Fauna client.
@@ -19,7 +22,7 @@ public static FaunaClient client() {
      * @param config Fauna configuration object.
      * @return A FaunaClient (or subclass of it).
      */
-    public static FaunaClient client(FaunaConfig config) {
+    public static FaunaClient client(final FaunaConfig config) {
         if (config == null) {
             throw new IllegalArgumentException("FaunaConfig cannot be null.");
         }
@@ -34,8 +37,8 @@ public static FaunaClient client(FaunaConfig config) {
      * @param retryStrategy An implementation of RetryStrategy.
      * @return A FaunaClient (or subclass of it).
      */
-    public static FaunaClient client(FaunaConfig config, HttpClient httpClient,
-                                     RetryStrategy retryStrategy) {
+    public static FaunaClient client(final FaunaConfig config, final HttpClient httpClient,
+                                     final RetryStrategy retryStrategy) {
         if (config == null) {
             throw new IllegalArgumentException("FaunaConfig cannot be null.");
         }
@@ -49,7 +52,7 @@ public static FaunaClient client(FaunaConfig config, HttpClient httpClient,
      * @param database The name of the database.
      * @return A FaunaClient (or subclass of it).
      */
-    public static FaunaClient scoped(FaunaClient client, String database) {
+    public static FaunaClient scoped(final FaunaClient client, final String database) {
         if (client == null) {
             throw new IllegalArgumentException("FaunaClient cannot be null.");
         }
@@ -69,8 +72,8 @@ public static FaunaClient scoped(FaunaClient client, String database) {
      * @param role     A Fauna role (either built-in or user defined).
      * @return A FaunaClient (or subclass of it).
      */
-    public static FaunaClient scoped(FaunaClient client, String database,
-                                     FaunaRole role) {
+    public static FaunaClient scoped(final FaunaClient client, final String database,
+                                     final FaunaRole role) {
         if (client == null) {
             throw new IllegalArgumentException("FaunaClient cannot be null.");
         }