Correct var names, improve documentation.

redisson/src/main/java/org/redisson/RedissonMapCache.java

@@ -96,13 +96,13 @@ public class RedissonMapCache<K, V> extends RedissonMap<K, V> implements RMapCac
     }
 
     @Override
-    public boolean trySetMaxSize(int permits) {
-        return get(trySetMaxSizeAsync(permits));
+    public boolean trySetMaxSize(int maxSize) {
+        return get(trySetMaxSizeAsync(maxSize));
     }
     
     @Override
     public RFuture<Boolean> trySetMaxSizeAsync(int maxSize) {
-        if (maxSize <= 0) {
+        if (maxSize < 0) {
             throw new IllegalArgumentException("maxSize should be greater than zero");
         }
         
@@ -110,13 +110,13 @@ public class RedissonMapCache<K, V> extends RedissonMap<K, V> implements RMapCac
     }
     
     @Override
-    public void setMaxSize(int permits) {
-        get(setMaxSizeAsync(permits));
+    public void setMaxSize(int maxSize) {
+        get(setMaxSizeAsync(maxSize));
     }
     
     @Override
     public RFuture<Void> setMaxSizeAsync(int maxSize) {
-        if (maxSize <= 0) {
+        if (maxSize < 0) {
             throw new IllegalArgumentException("maxSize should be greater than zero");
         }
         

redisson/src/main/java/org/redisson/api/RMapCache.java

@@ -44,6 +44,7 @@ public interface RMapCache<K, V> extends RMap<K, V>, RMapCacheAsync<K, V> {
      * Superfluous elements are evicted using LRU algorithm.
      * 
      * @param maxSize - max size
+     *                  If <code>0</code> the cache is unbounded (default).
      */
     void setMaxSize(int maxSize);
     
@@ -53,6 +54,7 @@ public interface RMapCache<K, V> extends RMap<K, V>, RMapCacheAsync<K, V> {
      *
      * @param maxSize - max size
      * @return <code>true</code> if max size has been successfully set, otherwise <code>false</code>.
+     *         If <code>0</code> the cache is unbounded (default).
      */
     boolean trySetMaxSize(int maxSize);