johnclara commented on a change in pull request #1844:
URL: https://github.com/apache/iceberg/pull/1844#discussion_r532266911
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File path: core/src/main/java/org/apache/iceberg/CatalogUtil.java
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@@ -171,45 +172,57 @@ public static Catalog loadCatalog(
/**
* Load a custom {@link FileIO} implementation.
+ */
+ public static FileIO loadFileIO(
+ String impl,
+ Map<String, String> properties,
+ Configuration hadoopConf) {
+ return loadCatalogConfigurable(impl, properties, hadoopConf, FileIO.class);
+ }
+
+ /**
+ * Load a custom implementation of a {@link CatalogConfigurable}.
* <p>
* The implementation must have a no-arg constructor.
- * If the class implements {@link Configurable},
+ * If the class implements Hadoop's {@link Configurable},
* a Hadoop config will be passed using {@link
Configurable#setConf(Configuration)}.
- * {@link FileIO#initialize(Map properties)} is called to complete the
initialization.
+ * {@link CatalogConfigurable#initialize(Map properties)} is called to
complete the initialization.
*
* @param impl full class name of a custom FileIO implementation
* @param hadoopConf hadoop configuration
+ * @param resultClass the final return class type
* @return FileIO class
* @throws IllegalArgumentException if class path not found or
* right constructor not found or
* the loaded class cannot be casted to the given interface type
*/
- public static FileIO loadFileIO(
+ public static <T extends CatalogConfigurable> T loadCatalogConfigurable(
String impl,
Map<String, String> properties,
- Configuration hadoopConf) {
- LOG.info("Loading custom FileIO implementation: {}", impl);
- DynConstructors.Ctor<FileIO> ctor;
+ Configuration hadoopConf,
+ Class<T> resultClass) {
+ LOG.info("Loading custom {} implementation: {}", resultClass.getName(),
impl);
+ DynConstructors.Ctor<T> ctor;
try {
- ctor = DynConstructors.builder(FileIO.class).impl(impl).buildChecked();
+ ctor = DynConstructors.builder(resultClass).impl(impl).buildChecked();
Review comment:
I'm also wondering if we should just use a ServiceLoader instead of
using the dyn constructors stuff? It seems to be more heavy duty
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