2.7.6 REST Metadata (#5738)

* Polish /#4687 : Remove the duplicated test code in dubbo-config-spring

* Polish /#4674 & /#4470

* Polish /#5093 : Revert the previous commit

* Polish #5093 : [Feature] Dubbo Services generate the metadata of REST services

* Polish #5306 : [Migration] Upgrade the @SInCE tags in Javadoc migration cloud native to master

* Polish #5306 : [Migration] Upgrade the @SInCE tags in Javadoc migration cloud native to master

* Polish #5309 : [ISSURE] The beans of Dubbo's Config can't be found on the ReferenceBean's initialization

* Polish #5312 : Resolve the demos' issues of zookeeper and nacos

* Polish #5313 : [Migration] migrate the code in common module from cloud-native branch to master

* Polish #5316 : [Refactor] Replace @EnableDubboConfigBinding Using spring-context-support

* Polish #5317 : [Refactor] Refactor ReferenceAnnotationBeanPostProcessor using Alibaba spring-context-suuport API

* Polish #5321 : Remove BeanFactoryUtils

* Polish #5321 : Remove AnnotatedBeanDefinitionRegistryUtils

* Polish #5321 : Remove AnnotationUtils

* Polish #5321 : Remove ClassUtils

* Polish #5321 : Remove BeanRegistrar

* Polish #5321 : Remove ObjectUtils

* Polish #5321 : Remove PropertySourcesUtils

* Polish #5325 : [Migration] To migrate dubbo-metadata-api from cloud-native branch

* Polish #5326 : [Migration] To migrate dubbo-metadata-processor from cloud-native branch

* Polish #5329 : [Feature] To add the default metadata into ServiceInstance

* Polish #5339 : [Refactor] Refactor the DynamicConfiguration interface

* Polish bugfix

* Fixes test cases

* Merge remote-tracking branch 'upstream/master' into cloud-native-2.7.5

# Conflicts:
#	dubbo-configcenter/dubbo-configcenter-zookeeper/src/test/java/org/apache/dubbo/configcenter/support/zookeeper/ZookeeperDynamicConfigurationTest.java
#	dubbo-metadata/dubbo-metadata-api/src/test/java/org/apache/dubbo/metadata/DynamicConfigurationServiceNameMappingTest.java

* Merge remote-tracking branch 'upstream/master' into cloud-native-2.7.5

# Conflicts:
#	dubbo-configcenter/dubbo-configcenter-zookeeper/src/test/java/org/apache/dubbo/configcenter/support/zookeeper/ZookeeperDynamicConfigurationTest.java
#	dubbo-metadata/dubbo-metadata-api/src/test/java/org/apache/dubbo/metadata/DynamicConfigurationServiceNameMappingTest.java

* Polish /#5721 : [Enhancement] Setting the default IDs for Dubbo's Config Beans

* Polish /#5729 : [Optimization] To remove EnableDubboConfigBinding and EnableDubboConfigBindings

* Polish /#5594 : [Feature] Add the resolver of ServiceRestMetadata based on Java Reflection

* Polish /#5736 : [Feature] Introducing Conversion features

* Polish /#5737 : [Feature] Introducing "dubbo-metadata-processor" module

* Polish /#5594 : Change the Metadata implementation

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

* Polish /#5594 : Fixed test cases

dubbo-common/src/main/java/org/apache/dubbo/common/convert/Converter.java

@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import org.apache.dubbo.common.extension.ExtensionLoader;
+import org.apache.dubbo.common.extension.SPI;
+import org.apache.dubbo.common.lang.Prioritized;
+
+import static org.apache.dubbo.common.extension.ExtensionLoader.getExtensionLoader;
+import static org.apache.dubbo.common.utils.ClassUtils.isAssignableFrom;
+import static org.apache.dubbo.common.utils.TypeUtils.findActualTypeArgument;
+
+/**
+ * A class to convert the source-typed value to the target-typed value
+ *
+ * @param <S> The source type
+ * @param <T> The target type
+ * @since 2.7.6
+ */
+@SPI
+@FunctionalInterface
+public interface Converter<S, T> extends Prioritized {
+
+    /**
+     * Accept the source type and target type or not
+     *
+     * @param sourceType the source type
+     * @param targetType the target type
+     * @return if accepted, return <code>true</code>, or <code>false</code>
+     */
+    default boolean accept(Class<?> sourceType, Class<?> targetType) {
+        return isAssignableFrom(sourceType, getSourceType()) && isAssignableFrom(targetType, getTargetType());
+    }
+
+    /**
+     * Convert the source-typed value to the target-typed value
+     *
+     * @param source the source-typed value
+     * @return the target-typed value
+     */
+    T convert(S source);
+
+    /**
+     * Get the source type
+     *
+     * @return non-null
+     */
+    default Class<S> getSourceType() {
+        return findActualTypeArgument(getClass(), Converter.class, 0);
+    }
+
+    /**
+     * Get the target type
+     *
+     * @return non-null
+     */
+    default Class<T> getTargetType() {
+        return findActualTypeArgument(getClass(), Converter.class, 1);
+    }
+
+    /**
+     * Get the Converter instance from {@link ExtensionLoader} with the specified source and target type
+     *
+     * @param sourceType the source type
+     * @param targetType the target type
+     * @return
+     * @see ExtensionLoader#getSupportedExtensionInstances()
+     */
+    static Converter<?, ?> getConverter(Class<?> sourceType, Class<?> targetType) {
+        return getExtensionLoader(Converter.class)
+                .getSupportedExtensionInstances()
+                .stream()
+                .filter(converter -> converter.accept(sourceType, targetType))
+                .findFirst()
+                .orElse(null);
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringConverter.java

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+/**
+ * A class to covert {@link String} to the target-typed value
+ *
+ * @see Converter
+ * @since 2.7.6
+ */
+@FunctionalInterface
+public interface StringConverter<T> extends Converter<String, T> {
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToBooleanConverter.java

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import static java.lang.Boolean.valueOf;
+import static org.apache.dubbo.common.utils.StringUtils.isNotEmpty;
+
+/**
+ * The class to convert {@link String} to {@link Boolean}
+ *
+ * @since 2.7.6
+ */
+public class StringToBooleanConverter implements StringConverter<Boolean> {
+
+    @Override
+    public Boolean convert(String source) {
+        return isNotEmpty(source) ? valueOf(source) : null;
+    }
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY + 5;
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToCharArrayConverter.java

@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+
+import static org.apache.dubbo.common.utils.StringUtils.isNotEmpty;
+
+/**
+ * The class to convert {@link String} to <code>char[]</code>
+ *
+ * @since 2.7.6
+ */
+public class StringToCharArrayConverter implements StringConverter<char[]> {
+
+    @Override
+    public char[] convert(String source) {
+        return isNotEmpty(source) ? source.toCharArray() : null;
+    }
+
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY + 7;
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToCharacterConverter.java

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import static org.apache.dubbo.common.utils.StringUtils.length;
+
+/**
+ * The class to convert {@link String} to {@link Character}
+ *
+ * @since 2.7.6
+ */
+public class StringToCharacterConverter implements StringConverter<Character> {
+
+    @Override
+    public Character convert(String source) {
+        int length = length(source);
+        if (length == 0) {
+            return null;
+        }
+        if (length > 1) {
+            throw new IllegalArgumentException("The source String is more than one character!");
+        }
+        return source.charAt(0);
+    }
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY + 8;
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToDoubleConverter.java

@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import static java.lang.Double.valueOf;
+import static org.apache.dubbo.common.utils.StringUtils.isNotEmpty;
+
+/**
+ * The class to convert {@link String} to {@link Double}
+ *
+ * @since 2.7.6
+ */
+public class StringToDoubleConverter implements StringConverter<Double> {
+
+    @Override
+    public Double convert(String source) {
+        return isNotEmpty(source) ? valueOf(source) : null;
+    }
+
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY + 3;
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToFloatConverter.java

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import static java.lang.Float.valueOf;
+import static org.apache.dubbo.common.utils.StringUtils.isNotEmpty;
+
+/**
+ * The class to convert {@link String} to {@link Float}
+ *
+ * @since 2.7.6
+ */
+public class StringToFloatConverter implements StringConverter<Float> {
+
+    @Override
+    public Float convert(String source) {
+        return isNotEmpty(source) ? valueOf(source) : null;
+    }
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY + 4;
+    }
+}

dubbo-common/src/main/java/org/apache/dubbo/common/convert/StringToIntegerConverter.java

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.convert;
+
+import static java.lang.Integer.valueOf;
+import static org.apache.dubbo.common.utils.StringUtils.isNotEmpty;
+
+/**
+ * The class to convert {@link String} to {@link Integer}
+ *
+ * @since 2.7.6
+ */
+public class StringToIntegerConverter implements StringConverter<Integer> {
+
+    @Override
+    public Integer convert(String source) {
+        return isNotEmpty(source) ? valueOf(source) : null;
+    }
+
+    @Override
+    public int getPriority() {
+        return NORMAL_PRIORITY;
+    }
+}