/**
* Merges another metadata registry into this metadata registry. Both registries are locked during
* this time, first this registry and then the other registry. Do not attempt to do a.merge(b) and
* b.merge(a) in separate threads at the same time or a deadlock may occur.
*/
public synchronized MetadataRegistry merge(MetadataRegistry other) {
synchronized (other) {
for (Map.Entry<RootKey, AttributeMetadataRegistryBuilder> entry :
other.attributes.entrySet()) {
RootKey key = entry.getKey();
AttributeMetadataRegistryBuilder builder = attributes.get(key);
if (builder == null) {
builder = new AttributeMetadataRegistryBuilder(this);
attributes.put(key, builder);
}
builder.merge(entry.getValue());
}
for (Map.Entry<RootKey, ElementMetadataRegistryBuilder> entry : other.elements.entrySet()) {
RootKey key = entry.getKey();
ElementMetadataRegistryBuilder builder = elements.get(key);
if (builder == null) {
builder = new ElementMetadataRegistryBuilder(this);
elements.put(key, builder);
}
builder.merge(entry.getValue());
}
}
return this;
}
