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- package com.winterbe.react;
- import jdk.nashorn.api.scripting.NashornScriptEngine;
- import javax.script.ScriptEngineManager;
- import javax.script.ScriptException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.Reader;
- import java.util.List;
- public class React {
- private ThreadLocal<NashornScriptEngine> engineHolder = new ThreadLocal<NashornScriptEngine>() {
- @Override
- protected NashornScriptEngine initialValue() {
- NashornScriptEngine nashornScriptEngine = (NashornScriptEngine) new ScriptEngineManager().getEngineByName("nashorn");
- try {
- nashornScriptEngine.eval(read("static/nashorn-polyfill.js"));
- nashornScriptEngine.eval(read("static/vendor/react.js"));
- nashornScriptEngine.eval(read("static/vendor/showdown.min.js"));
- nashornScriptEngine.eval(read("static/commentBox.js"));
- } catch (ScriptException e) {
- throw new RuntimeException(e);
- }
- return nashornScriptEngine;
- }
- };
- public String renderCommentBox(List<Comment> comments) {
- try {
- Object html = engineHolder.get().invokeFunction("renderServer", comments);
- return String.valueOf(html);
- }
- catch (Exception e) {
- throw new IllegalStateException("failed to render react component", e);
- }
- }
- private Reader read(String path) {
- InputStream in = getClass().getClassLoader().getResourceAsStream(path);
- return new InputStreamReader(in);
- }
- }
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