/**
* Retrieves, but does not remove, the first allocated container on the specified host.
*
* @param host the host for which a container is needed.
* @return the first {@link Container} allocated for the specified host or {@code null} if there
* isn't one.
*/
protected Container peekAllocatedContainer(String host) {
List<Container> allocatedContainers = containerRequestState.getContainersOnAHost(host);
if (allocatedContainers == null || allocatedContainers.isEmpty()) {
return null;
}
return allocatedContainers.get(0);
}
