replace custom pool implementation with apache's

src/main/java/redis/clients/util/Pool.java

@@ -0,0 +1,30 @@
+package redis.clients.util;
+
+import org.apache.commons.pool.PoolableObjectFactory;
+import org.apache.commons.pool.impl.GenericObjectPool;
+
+public abstract class Pool<T> {
+    private final GenericObjectPool internalPool;
+
+    public Pool(final GenericObjectPool.Config poolConfig,
+            PoolableObjectFactory factory) {
+        this.internalPool = new GenericObjectPool(factory, poolConfig);
+    }
+
+    @SuppressWarnings("unchecked")
+    public T getResource() throws Exception {
+        return (T) internalPool.borrowObject();
+    }
+
+    public void returnResource(final T resource) throws Exception {
+        internalPool.returnObject(resource);
+    }
+
+    public void returnBrokenResource(final T resource) throws Exception {
+        internalPool.invalidateObject(resource);
+    }
+
+    public void destroy() throws Exception {
+        internalPool.close();
+    }
+}