Clarify the documentation. Add the hash config to the example config. Uses duration in the delay field instead of the seconds.

src/main/java/io/kamax/mxisd/config/DurationDeserializer.java

@@ -0,0 +1,30 @@
+package io.kamax.mxisd.config;
+
+public class DurationDeserializer {
+
+    public long deserialize(String argument) {
+        long duration = 0L;
+        for (String part : argument.split(" ")) {
+            String unit = part.substring(part.length() - 1);
+            long value = Long.parseLong(part.substring(0, part.length() - 1));
+            switch (unit) {
+                case "s":
+                    duration += value;
+                    break;
+                case "m":
+                    duration += value * 60;
+                    break;
+                case "h":
+                    duration += value * 60 * 60;
+                    break;
+                case "d":
+                    duration += value * 60 * 60 * 24;
+                    break;
+                default:
+                    throw new IllegalArgumentException(String.format("Unknown duration unit: %s", unit));
+            }
+        }
+
+        return duration;
+    }
+}

src/main/java/io/kamax/mxisd/config/HashingConfig.java

@@ -14,7 +14,8 @@ public class HashingConfig {
     private int pepperLength = 20;
     private RotationPolicyEnum rotationPolicy;
     private HashStorageEnum hashStorageType;
-    private long delay = 10;
+    private String delay = "10s";
+    private transient long delayInSeconds = 10;
     private int requests = 10;
     private List<Algorithm> algorithms = new ArrayList<>();
 
@@ -24,13 +25,15 @@ public class HashingConfig {
             LOGGER.info("   Pepper length: {}", getPepperLength());
             LOGGER.info("   Rotation policy: {}", getRotationPolicy());
             LOGGER.info("   Hash storage type: {}", getHashStorageType());
-            if (RotationPolicyEnum.per_seconds == rotationPolicy) {
-                LOGGER.info("   Rotation delay: {}", delay);
+            if (RotationPolicyEnum.per_seconds == getRotationPolicy()) {
+                setDelayInSeconds(new DurationDeserializer().deserialize(getDelay()));
+                LOGGER.info("   Rotation delay: {}", getDelay());
+                LOGGER.info("   Rotation delay in seconds: {}", getDelayInSeconds());
             }
-            if (RotationPolicyEnum.per_requests == rotationPolicy) {
-                LOGGER.info("   Rotation after requests: {}", requests);
+            if (RotationPolicyEnum.per_requests == getRotationPolicy()) {
+                LOGGER.info("   Rotation after requests: {}", getRequests());
             }
-            LOGGER.info("   Algorithms: {}", algorithms);
+            LOGGER.info("   Algorithms: {}", getAlgorithms());
         } else {
             LOGGER.info("Hash configuration disabled, used only `none` pepper.");
         }
@@ -83,14 +86,22 @@ public class HashingConfig {
         this.hashStorageType = hashStorageType;
     }
 
-    public long getDelay() {
+    public String getDelay() {
         return delay;
     }
 
-    public void setDelay(long delay) {
+    public void setDelay(String delay) {
         this.delay = delay;
     }
 
+    public long getDelayInSeconds() {
+        return delayInSeconds;
+    }
+
+    public void setDelayInSeconds(long delayInSeconds) {
+        this.delayInSeconds = delayInSeconds;
+    }
+
     public int getRequests() {
         return requests;
     }

src/main/java/io/kamax/mxisd/hash/HashManager.java

@@ -61,7 +61,7 @@ public class HashManager {
                     this.rotationStrategy = new RotationPerRequests(config.getRequests());
                     break;
                 case per_seconds:
-                    this.rotationStrategy = new TimeBasedRotation(config.getDelay());
+                    this.rotationStrategy = new TimeBasedRotation(config.getDelayInSeconds());
                     break;
                 default:
                     throw new IllegalArgumentException("Unknown rotation type: " + config.getHashStorageType());