@Override
public Set<NodeId> getAvailableNodes(NodeType type) {
Set<NodeId> result = Sets.newHashSet();
ZNode typeNode = rootNode.child(CoordinationUtil.nodeNameOf(type));
for (ZNode node : typeNode.children()) {
if (node.hasChild(CoordinationUtil.AVAILABLE_NODE_NAME)) {
result.add(NodeId.of(type, node.getShortPath()));
}
}
return result;
}
@Override
public boolean canExecuteCommands(NodeId nodeId, Set<Qualifier<?>> qualifiers) {
ZNode typeNode = rootNode.child(CoordinationUtil.nodeNameOf(nodeId.getType()));
String identifier = nodeId.getIdentifier();
if (!typeNode.hasChild(identifier)) {
throw new CoordinatorException("Node with id " + nodeId + " is not found");
}
ZNode node = typeNode.child(identifier);
if (!node.hasChild(CoordinationUtil.AVAILABLE_NODE_NAME)) {
return false;
}
for (Qualifier<?> qualifier : qualifiers) {
if (!node.hasChild(nodeNameOf(qualifier))) {
return false;
}
}
return true;
}
@Override
public void waitForInitialization() {
log.info("Waiting for coordination znode structure structure initialization");
while (true) {
boolean initialized =
rootNode.exists() && rootNode.hasChild(CoordinationUtil.STATUSES_NODE_NAME);
if (initialized) {
log.info("Coordination znode structure initialized");
break;
}
try {
Thread.sleep(INITIALIZATION_SLEEP_PERIOD);
log.info("Znode structure is not initialized. Waiting {} ms", INITIALIZATION_SLEEP_PERIOD);
} catch (InterruptedException e) {
log.warn("Sleep interrupted", e);
}
}
}