Github user yaojiefeng commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r86285363
--- Diff:
twill-core/src/main/java/org/apache/twill/internal/json/ResourceReportAdapter.java
---
@@ -59,4 +72,61 @@ public ResourceReport fromJson(String json) {
public ResourceReport fromJson(Reader reader) {
return gson.fromJson(reader, ResourceReport.class);
}
+
+ /**
+ * A type adapter for serializing {@code Collection<TwillRunResources>}
correctly
+ */
+ private static final class ResourceReportTypeAdapterFactory implements
TypeAdapterFactory {
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+ if (!Collection.class.isAssignableFrom(type.getRawType())) {
+ return null;
--- End diff --
This factory is specifically for serializing`Collection<TwillRunResources>`
since Gson will not catch the inner class for it. So we only need to create the
TypeAdapter when we encounter `Collection<TwillRunResources>`. Actually the
implementation is simulated from `TwillRuntimeSpecificationAdapter`, which
create factory to deal with similar situation,
https://github.com/apache/twill/blob/master/twill-core/src/main/java/org/apache/twill/internal/json/TwillRuntimeSpecificationAdapter.java#L106
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