core/src/in/srain/cube/image/ImageTask.java
protected String generateIdentityKey() {
        if (mRequest.getImageReuseInfo() == null) {
            return getIdentityUrl();
        } else {
            return joinSizeTagToKey(getIdentityUrl(), mRequest.getImageReuseInfo().getIdentitySize());
        }
    }
protected String generateIdentityKey() {
        if (mRequest.getImageReuseInfo() == null) {
            return getIdentityUrl();
        } else {
            return joinSizeTagToKey(getIdentityUrl(), mRequest.getImageReuseInfo().getIdentitySize());
        }
    }
Generate the identity key.
<p/>
This key should be related to the unique image this task is requesting: the size, the remote url.

@return