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/*
* 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.metadata.rest;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import static java.util.Collections.unmodifiableList;
import static org.apache.dubbo.common.function.ThrowableAction.execute;
import static org.apache.dubbo.metadata.rest.RestMetadataConstants.METADATA_ENCODING;
import static org.apache.dubbo.metadata.rest.RestMetadataConstants.SERVICE_REST_METADATA_RESOURCE_PATH;
/**
* Class-Path based {@link ServiceRestMetadataReader} implementation
*
* @see ServiceRestMetadataReader
* @since 2.7.6
*/
public class ClassPathServiceRestMetadataReader implements ServiceRestMetadataReader {
private final String serviceRestMetadataJsonResourcePath;
public ClassPathServiceRestMetadataReader() {
this(SERVICE_REST_METADATA_RESOURCE_PATH);
}
public ClassPathServiceRestMetadataReader(String serviceRestMetadataJsonResourcePath) {
this.serviceRestMetadataJsonResourcePath = serviceRestMetadataJsonResourcePath;
}
@Override
public List read() {
List serviceRestMetadataList = new LinkedList<>();
ClassLoader classLoader = getClass().getClassLoader();
execute(() -> {
Enumeration resources = classLoader.getResources(serviceRestMetadataJsonResourcePath);
Gson gson = new Gson();
while (resources.hasMoreElements()) {
URL resource = resources.nextElement();
InputStream inputStream = resource.openStream();
JsonParser parser = new JsonParser();
JsonElement jsonElement = parser.parse(new InputStreamReader(inputStream, METADATA_ENCODING));
if (jsonElement.isJsonArray()) {
JsonArray jsonArray = jsonElement.getAsJsonArray();
for (int i = 0; i < jsonArray.size(); i++) {
JsonElement childJsonElement = jsonArray.get(i);
ServiceRestMetadata serviceRestMetadata = gson.fromJson(childJsonElement, ServiceRestMetadata.class);
serviceRestMetadataList.add(serviceRestMetadata);
}
}
}
});
return unmodifiableList(serviceRestMetadataList);
}
}