@Override
                public T getHead() {
                    return head;
                }
@see io.apiman.gateway.engine.components.ICacheStoreComponent#getBinary(java.lang.String, java.lang.Class, io.apiman.gateway.engine.async.IAsyncResultHandler)
gateway/engine/core/src/main/java/io/apiman/gateway/engine/impl/InMemoryCacheStoreComponent.java