Add retry limit functionality

- added variables retryLimit and retryNumber to Retryable.java
- added function isNotSurpassingRetryLimit() to Retryable.java
- added retry limit check to actor.does() and actor.checks() for RetryableTask & Retryable.Question

#234

modules/core/src/main/java/org/shakespeareframework/Actor.java

@@ -87,6 +87,11 @@ public Actor does(RetryableTask task) {
 
     while (true) {
       try {
+        if (task.isNotSurpassingRetryLimit()){
+          reporters.forEach(reporter -> reporter.success(this, task));
+          return this;
+        }
+
         task.performAs(this);
         reporters.forEach(reporter -> reporter.success(this, task));
         return this;
@@ -156,6 +161,15 @@ public <A> A checks(RetryableQuestion<A> question) {
         lastAnswer = answer;
         lastException = null;
 
+        if(question.isNotSurpassingRetryLimit()){
+          reporters.forEach(reporter -> reporter.success(this, question, answer));
+          return answer;
+        }
+        if(question.maxRetries != null && question.retryNumber > question.maxRetries){
+          reporters.forEach(reporter -> reporter.success(this, question, answer));
+          return answer;
+        }
+
         if (question.acceptable(lastAnswer)) {
           reporters.forEach(reporter -> reporter.success(this, question, answer));
           return answer;

modules/core/src/main/java/org/shakespeareframework/Retryable.java

@@ -8,20 +8,49 @@
  */
 public interface Retryable {
 
-  /** The default timeout */
-  Duration DEFAULT_TIMEOUT = Duration.ofSeconds(2);
-
-  /**
-   * @return the timeout for this (default: {@link #DEFAULT_TIMEOUT})
-   */
-  default Duration getTimeout() {
-    return DEFAULT_TIMEOUT;
-  }
-
-  /**
-   * @return the interval to retry this (default {@link #getTimeout()} / 10)
-   */
-  default Duration getInterval() {
-    return DEFAULT_TIMEOUT.dividedBy(10);
-  }
+    /**
+     * The default timeout
+     */
+    Duration DEFAULT_TIMEOUT = Duration.ofSeconds(2);
+    Integer retryLimit = null;
+    Integer retryNumber = 0;
+
+    /**
+     * @return the timeout for this (default: {@link #DEFAULT_TIMEOUT})
+     */
+    default Duration getTimeout() {
+        return DEFAULT_TIMEOUT;
+    }
+
+    /**
+     * @return the interval to retry this (default {@link #getTimeout()} / 10)
+     */
+    default Duration getInterval() {
+        return DEFAULT_TIMEOUT.dividedBy(10);
+    }
+
+    /**
+     * @return the maximum amount of allowed retries (default {@link #retryLimit})
+     */
+    default Integer getMaxRetries() {
+        return retryLimit;
+    }
+
+    /**
+     * @return the number of the current retry (default {@link #retryNumber})
+     */
+    default Integer getRetryNumber() {
+        return retryNumber;
+    }
+
+    /**
+     * @return false if a retry limit is set and the current retry number surpasses given limit (default {@link true})
+     * function call increases retry number by one
+     */
+    default boolean isNotSurpassingRetryLimit() {
+        if (retryLimit == null) return true
+        if (retryNumber > retryLimit) return false
+        retryNumber++;
+        return true;
+    }
 }