ENH: support plugin loading in conifg

data-prepper-api/build.gradle

@@ -12,9 +12,10 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8'
+    implementation libs.reflections.core
     implementation libs.parquet.common
-    testImplementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
     implementation libs.commons.lang3
+    testImplementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
     testImplementation project(':data-prepper-test-common')
     testImplementation 'org.skyscreamer:jsonassert:1.5.3'
     testImplementation libs.commons.io

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/annotations/UsesDataPrepperPlugin.java

@@ -0,0 +1,23 @@
+package org.opensearch.dataprepper.model.annotations;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotates a field that uses Data Prepper plugin config as its value.
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD})
+public @interface UsesDataPrepperPlugin {
+    /**
+     * The class type for this plugin.
+     *
+     * @return The Java class
+     * @since 1.2
+     */
+    Class<?> pluginType();
+}

data-prepper-plugin-framework/src/main/java/org/opensearch/dataprepper/plugin/ClasspathPluginProvider.java

@@ -18,6 +18,7 @@
 import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static org.opensearch.dataprepper.model.annotations.DataPrepperPlugin.DEFAULT_ALTERNATE_NAME;
 import static org.opensearch.dataprepper.model.annotations.DataPrepperPlugin.DEFAULT_DEPRECATED_NAME;
@@ -60,6 +61,20 @@ public <T> Optional<Class<? extends T>> findPluginClass(final Class<T> pluginTyp
         return Optional.ofNullable((Class<? extends T>) supportedTypesMap.get(pluginType));
     }
 
+    @Override
+    public <T> Set<Class<? extends T>> findPluginClasses(Class<T> pluginType) {
+        if (nameToSupportedTypeToPluginType == null) {
+            nameToSupportedTypeToPluginType = scanForPlugins();
+        }
+
+        return nameToSupportedTypeToPluginType.values().stream()
+                .flatMap(supportedTypeToPluginType ->
+                        supportedTypeToPluginType.entrySet().stream()
+                                .filter(entry -> pluginType.equals(entry.getKey()))
+                                .flatMap(entry -> Stream.of((Class<? extends T>) entry.getValue())))
+                .collect(Collectors.toSet());
+    }
+
     private Map<String, Map<Class<?>, Class<?>>> scanForPlugins() {
         final Set<Class<?>> dataPrepperPluginClasses =
                 reflections.getTypesAnnotatedWith(DataPrepperPlugin.class);

data-prepper-plugin-framework/src/main/java/org/opensearch/dataprepper/plugin/PluginProvider.java

@@ -5,6 +5,7 @@
 
 package org.opensearch.dataprepper.plugin;
 
+import java.util.Collection;
 import java.util.Optional;
 
 /**
@@ -27,4 +28,15 @@ public interface PluginProvider {
      * @since 1.2
      */
     <T> Optional<Class<? extends T>> findPluginClass(Class<T> pluginType, String pluginName);
+
+    /**
+     * Finds the Java classes for a specific pluginType.
+     *
+     * @param pluginType The type of plugin which is being supported.
+     *                   e.g. {@link org.opensearch.dataprepper.model.sink.Sink}.
+     * @param <T> The type
+     * @return An {@link Collection} of Java classes for plugins
+     * @since 1.2
+     */
+    <T> Collection<Class<? extends T>> findPluginClasses(Class<T> pluginType);
 }

data-prepper-plugin-framework/src/test/java/org/opensearch/dataprepper/plugin/ClasspathPluginProviderTest.java

@@ -11,20 +11,24 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 import org.opensearch.dataprepper.model.annotations.DataPrepperPlugin;
+import org.opensearch.dataprepper.model.configuration.PluginSetting;
 import org.opensearch.dataprepper.model.sink.Sink;
 import org.opensearch.dataprepper.model.source.Source;
 import org.opensearch.dataprepper.plugins.test.TestSink;
 import org.opensearch.dataprepper.plugins.test.TestSource;
 import org.reflections.Reflections;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
+import java.util.Set;
 import java.util.UUID;
 
 import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.mockito.BDDMockito.given;
@@ -61,6 +65,22 @@ void findPlugin_should_scan_for_plugins() {
                 .getTypesAnnotatedWith(DataPrepperPlugin.class);
     }
 
+    @Test
+    void findPlugins_should_scan_for_plugins() {
+        final ClasspathPluginProvider objectUnderTest = createObjectUnderTest();
+
+        then(reflections).shouldHaveNoInteractions();
+
+        given(reflections.getTypesAnnotatedWith(DataPrepperPlugin.class))
+                .willReturn(Collections.emptySet());
+
+        objectUnderTest.findPluginClasses(Sink.class);
+
+        then(reflections)
+                .should()
+                .getTypesAnnotatedWith(DataPrepperPlugin.class);
+    }
+
     @Test
     void findPlugin_should_scan_for_plugins_only_once() {
         final ClasspathPluginProvider objectUnderTest = createObjectUnderTest();
@@ -76,6 +96,21 @@ void findPlugin_should_scan_for_plugins_only_once() {
                 .getTypesAnnotatedWith(DataPrepperPlugin.class);
     }
 
+    @Test
+    void findPlugins_should_scan_for_plugins_only_once() {
+        final ClasspathPluginProvider objectUnderTest = createObjectUnderTest();
+
+        given(reflections.getTypesAnnotatedWith(DataPrepperPlugin.class))
+                .willReturn(Collections.emptySet());
+
+        for (int i = 0; i < 10; i++)
+            objectUnderTest.findPluginClasses(Sink.class);
+
+        then(reflections)
+                .should()
+                .getTypesAnnotatedWith(DataPrepperPlugin.class);
+    }
+
     @Test
     void findPlugin_should_return_empty_if_no_plugins_found() {
         given(reflections.getTypesAnnotatedWith(DataPrepperPlugin.class))
@@ -130,6 +165,17 @@ void findPlugin_should_return_plugin_if_found_for_alternate_name_and_type_using_
         assertThat(optionalPlugin.get(), equalTo(TestSource.class));
     }
 
+    @Test
+    void findPlugins_should_return_empty_if_no_plugins_found() {
+        given(reflections.getTypesAnnotatedWith(DataPrepperPlugin.class))
+                .willReturn(Collections.emptySet());
+
+        final Collection<Class<? extends PluginSetting>> foundPlugins = createObjectUnderTest().findPluginClasses(
+                PluginSetting.class);
+        assertThat(foundPlugins, notNullValue());
+        assertThat(foundPlugins.isEmpty(), is(true));
+    }
+
     @Nested
     class WithPredefinedPlugins {
 
@@ -161,5 +207,13 @@ void findPlugin_should_return_plugin_if_found_for_name_and_type_using_pluginType
             assertThat(optionalPlugin.isPresent(), equalTo(true));
             assertThat(optionalPlugin.get(), equalTo(TestSink.class));
         }
+
+        @Test
+        void findPlugins_should_return_plugins_if_plugin_found_for_specified_type() {
+            final Set<Class<? extends Source>> foundPlugins = createObjectUnderTest().findPluginClasses(Source.class);
+            assertThat(foundPlugins, notNullValue());
+            assertThat(foundPlugins.size(), equalTo(1));
+            assertThat(foundPlugins.stream().iterator().next(), equalTo(TestSource.class));
+        }
     }
 }

data-prepper-plugin-schema-cli/build.gradle

@@ -9,6 +9,7 @@ application {
 
 dependencies {
     implementation project(':data-prepper-plugins')
+    implementation project(':data-prepper-plugin-framework')
     implementation project(':data-prepper-plugin-schema')
     implementation 'com.fasterxml.jackson.core:jackson-databind'
     implementation 'org.reflections:reflections:0.10.2'

data-prepper-plugin-schema-cli/src/main/java/org/opensearch/dataprepper/schemas/DataPrepperPluginSchemaExecute.java

@@ -5,11 +5,9 @@
 import com.github.victools.jsonschema.generator.SchemaVersion;
 import com.github.victools.jsonschema.module.jakarta.validation.JakartaValidationModule;
 import com.github.victools.jsonschema.module.jakarta.validation.JakartaValidationOption;
+import org.opensearch.dataprepper.plugin.ClasspathPluginProvider;
+import org.opensearch.dataprepper.plugin.PluginProvider;
 import org.opensearch.dataprepper.schemas.module.CustomJacksonModule;
-import org.reflections.Reflections;
-import org.reflections.scanners.Scanners;
-import org.reflections.util.ClasspathHelper;
-import org.reflections.util.ConfigurationBuilder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import picocli.CommandLine;
@@ -58,11 +56,9 @@ public void run() {
                 new JakartaValidationModule(JakartaValidationOption.NOT_NULLABLE_FIELD_IS_REQUIRED,
                         JakartaValidationOption.INCLUDE_PATTERN_EXPRESSIONS)
         );
-        final Reflections reflections = new Reflections(new ConfigurationBuilder()
-                .setUrls(ClasspathHelper.forPackage(DEFAULT_PLUGINS_CLASSPATH))
-                .setScanners(Scanners.TypesAnnotated, Scanners.SubTypes));
+        final PluginProvider pluginProvider = new ClasspathPluginProvider();
         final PluginConfigsJsonSchemaConverter pluginConfigsJsonSchemaConverter = new PluginConfigsJsonSchemaConverter(
-                reflections, new JsonSchemaConverter(modules), siteUrl, siteBaseUrl);
+                pluginProvider, new JsonSchemaConverter(modules, pluginProvider), siteUrl, siteBaseUrl);
         final Class<?> pluginType = pluginConfigsJsonSchemaConverter.pluginTypeNameToPluginType(pluginTypeName);
         final Map<String, String> pluginNameToJsonSchemaMap = pluginConfigsJsonSchemaConverter.convertPluginConfigsIntoJsonSchemas(
                 SchemaVersion.DRAFT_2020_12, OptionPreset.PLAIN_JSON, pluginType);

data-prepper-plugin-schema/src/main/java/org/opensearch/dataprepper/schemas/JsonSchemaConverter.java

@@ -10,16 +10,27 @@
 import com.github.victools.jsonschema.generator.SchemaGeneratorConfig;
 import com.github.victools.jsonschema.generator.SchemaGeneratorConfigBuilder;
 import com.github.victools.jsonschema.generator.SchemaGeneratorConfigPart;
+import com.github.victools.jsonschema.generator.SchemaGeneratorGeneralConfigPart;
 import com.github.victools.jsonschema.generator.SchemaVersion;
+import org.opensearch.dataprepper.model.annotations.DataPrepperPlugin;
+import org.opensearch.dataprepper.model.annotations.UsesDataPrepperPlugin;
+import org.opensearch.dataprepper.plugin.PluginProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
 
 public class JsonSchemaConverter {
+    private static final Logger LOG = LoggerFactory.getLogger(JsonSchemaConverter.class);
     static final String DEPRECATED_SINCE_KEY = "deprecated";
     private final List<Module> jsonSchemaGeneratorModules;
+    private final PluginProvider pluginProvider;
 
-    public JsonSchemaConverter(final List<Module> jsonSchemaGeneratorModules) {
+    public JsonSchemaConverter(final List<Module> jsonSchemaGeneratorModules, final PluginProvider pluginProvider) {
         this.jsonSchemaGeneratorModules = jsonSchemaGeneratorModules;
+        this.pluginProvider = pluginProvider;
     }
 
     public ObjectNode convertIntoJsonSchema(
@@ -30,7 +41,9 @@ public ObjectNode convertIntoJsonSchema(
         loadJsonSchemaGeneratorModules(configBuilder);
         final SchemaGeneratorConfigPart<FieldScope> scopeSchemaGeneratorConfigPart = configBuilder.forFields();
         overrideInstanceAttributeWithDeprecated(scopeSchemaGeneratorConfigPart);
+        overrideTargetTypeWithUsesDataPrepperPlugin(scopeSchemaGeneratorConfigPart);
         resolveDefaultValueFromJsonProperty(scopeSchemaGeneratorConfigPart);
+        overrideDataPrepperPluginTypeAttribute(configBuilder.forTypesInGeneral(), schemaVersion, optionPreset);
 
         final SchemaGeneratorConfig config = configBuilder.build();
         final SchemaGenerator generator = new SchemaGenerator(config);
@@ -52,6 +65,37 @@ private void overrideInstanceAttributeWithDeprecated(
         });
     }
 
+    private void overrideTargetTypeWithUsesDataPrepperPlugin(
+            final SchemaGeneratorConfigPart<FieldScope> scopeSchemaGeneratorConfigPart) {
+        scopeSchemaGeneratorConfigPart.withTargetTypeOverridesResolver(field -> Optional
+                .ofNullable(field.getAnnotationConsideringFieldAndGetterIfSupported(UsesDataPrepperPlugin.class))
+                .map(usesDataPrepperPlugin ->
+                        pluginProvider.findPluginClasses(usesDataPrepperPlugin.pluginType()).stream())
+                .map(stream -> stream.map(specificSubtype -> field.getContext().resolve(specificSubtype)))
+                .map(stream -> stream.collect(Collectors.toList()))
+                .orElse(null));
+    }
+
+    private void overrideDataPrepperPluginTypeAttribute(
+            final SchemaGeneratorGeneralConfigPart schemaGeneratorGeneralConfigPart,
+            final SchemaVersion schemaVersion, final OptionPreset optionPreset) {
+        schemaGeneratorGeneralConfigPart.withTypeAttributeOverride((node, scope, context) -> {
+            final DataPrepperPlugin dataPrepperPlugin = scope.getType().getErasedType()
+                    .getAnnotation(DataPrepperPlugin.class);
+            if (dataPrepperPlugin != null) {
+                final ObjectNode propertiesNode = node.putObject("properties");
+                try {
+                    final ObjectNode schemaNode = this.convertIntoJsonSchema(
+                            schemaVersion, optionPreset, dataPrepperPlugin.pluginConfigurationType());
+                    propertiesNode.set(dataPrepperPlugin.name(), schemaNode);
+                } catch (JsonProcessingException e) {
+                    LOG.error("Encountered error retrieving JSON schema for {}", dataPrepperPlugin.name(), e);
+                    throw new RuntimeException(e);
+                }
+            }
+        });
+    }
+
     private void resolveDefaultValueFromJsonProperty(
             final SchemaGeneratorConfigPart<FieldScope> scopeSchemaGeneratorConfigPart) {
         scopeSchemaGeneratorConfigPart.withDefaultResolver(field -> {

data-prepper-plugin-schema/src/main/java/org/opensearch/dataprepper/schemas/PluginConfigsJsonSchemaConverter.java

@@ -1,6 +1,5 @@
 package org.opensearch.dataprepper.schemas;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.github.victools.jsonschema.generator.OptionPreset;
 import com.github.victools.jsonschema.generator.SchemaVersion;
@@ -10,7 +9,7 @@
 import org.opensearch.dataprepper.model.processor.Processor;
 import org.opensearch.dataprepper.model.sink.Sink;
 import org.opensearch.dataprepper.model.source.Source;
-import org.reflections.Reflections;
+import org.opensearch.dataprepper.plugin.PluginProvider;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -51,15 +50,15 @@ public class PluginConfigsJsonSchemaConverter {
 
     private final String siteUrl;
     private final String siteBaseUrl;
-    private final Reflections reflections;
+    private final PluginProvider pluginProvider;
     private final JsonSchemaConverter jsonSchemaConverter;
 
     public PluginConfigsJsonSchemaConverter(
-            final Reflections reflections,
+            final PluginProvider pluginProvider,
             final JsonSchemaConverter jsonSchemaConverter,
             final String siteUrl,
             final String siteBaseUrl) {
-        this.reflections = reflections;
+        this.pluginProvider = pluginProvider;
         this.jsonSchemaConverter = jsonSchemaConverter;
         this.siteUrl = siteUrl == null ? SITE_URL_PLACEHOLDER : siteUrl;
         this.siteBaseUrl = siteBaseUrl == null ? SITE_BASE_URL_PLACEHOLDER : siteBaseUrl;
@@ -90,8 +89,8 @@ public Map<String, String> convertPluginConfigsIntoJsonSchemas(
                         addPluginName(jsonSchemaNode, pluginName);
                         addDocumentationLink(jsonSchemaNode, pluginName, pluginType);
                         value = jsonSchemaNode.toPrettyString();
-                    } catch (JsonProcessingException e) {
-                        LOG.error("Encountered error retrieving JSON schema for {}", pluginName);
+                    } catch (final Exception e) {
+                        LOG.error("Encountered error retrieving JSON schema for {}", pluginName, e);
                         return Stream.empty();
                     }
                     return Stream.of(Map.entry(entry.getKey(), value));
@@ -107,7 +106,7 @@ private Map<String, Class<?>> scanForPluginConfigs(final Class<?> pluginType) {
         if (ConditionalRoute.class.equals(pluginType)) {
             return Map.of(CONDITIONAL_ROUTE_PROCESSOR_NAME, ConditionalRoute.class);
         }
-        return reflections.getTypesAnnotatedWith(DataPrepperPlugin.class).stream()
+        return pluginProvider.findPluginClasses(pluginType).stream()
                         .map(clazz -> clazz.getAnnotation(DataPrepperPlugin.class))
                         .filter(dataPrepperPlugin -> pluginType.equals(dataPrepperPlugin.pluginType()))
                         .collect(Collectors.toMap(