sijie commented on a change in pull request #5357: [functions][Issue:5350]Fix
pulsar can't load the customized SerDe
URL: https://github.com/apache/pulsar/pull/5357#discussion_r339349691
##########
File path:
pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/source/TopicSchema.java
##########
@@ -163,6 +168,43 @@ private static boolean isProtobufClass(Class<?>
pojoClazz) {
}
}
+ @SuppressWarnings("unchecked")
+ private <T> Schema<T> newSchemaInstance(String topic, Class<T> clazz,
String schemaTypeOrClassName, boolean input, ClassLoader classLoader) {
+ // The schemaTypeOrClassName can represent multiple thing, either a
schema type, a schema class name or a ser-de
+ // class name.
+
+ if (StringUtils.isEmpty(schemaTypeOrClassName) ||
DEFAULT_SERDE.equals(schemaTypeOrClassName)) {
+ // No preferred schema was provided, auto-discover schema or
fallback to defaults
+ return newSchemaInstance(clazz, getSchemaTypeOrDefault(topic,
clazz));
+ }
+
+ SchemaType schemaType = null;
+ try {
+ schemaType =
SchemaType.valueOf(schemaTypeOrClassName.toUpperCase());
+ } catch (IllegalArgumentException e) {
+ // schemaType is not referring to builtin type
+ }
+
+ if (schemaType != null) {
+ // The parameter passed was indeed a valid builtin schema type
+ return newSchemaInstance(clazz, schemaType);
+ }
+
+ // At this point, the string can represent either a schema or serde
class name. Create an instance and
+ // check if it complies with either interface
+
+ // First try with Schema
+ try {
+ return (Schema<T>)
InstanceUtils.initializeCustomSchema(schemaTypeOrClassName,
+ classLoader, clazz, input);
+ } catch (Throwable t) {
+ // Now try with Serde or just fail
+ SerDe<T> serDe = (SerDe<T>)
InstanceUtils.initializeSerDe(schemaTypeOrClassName,
+ classLoader, clazz, input);
+ return new SerDeSchema<>(serDe);
+ }
+ }
+
@SuppressWarnings("unchecked")
private <T> Schema<T> newSchemaInstance(String topic, Class<T> clazz,
String schemaTypeOrClassName, boolean input) {
Review comment:
Can you rewrite this method by calling the method in line 172?
```
private <T> Schema<T> newSchemaInstance(String topic, Class<T> clazz, String
schemaTypeOrClassName, boolean input) {
return newSchemaInstance(topic, clazz, schemaTypeOrClassName, input,
Thread.currentThread().getContextClassLoader());
}
```
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