chore(project): 添加项目配置文件和忽略规则

- 添加 Babel 配置文件支持 ES6+ 语法转换
- 添加 ESLint 忽略规则和配置文件
- 添加 Git 忽略规则文件
- 添加 Travis CI 配置文件
- 添加 1.4.2 版本变更日志文件
- 添加 Helm 图表辅助模板文件
- 添加 Helm 忽略规则文件

rm-datasource/src/main/java/io/seata/rm/GlobalLockTemplate.java

@@ -0,0 +1,57 @@
+/*
+ *  Copyright 1999-2019 Seata.io Group.
+ *
+ *  Licensed 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 io.seata.rm;
+
+import io.seata.core.context.GlobalLockConfigHolder;
+import io.seata.core.context.RootContext;
+import io.seata.core.model.GlobalLockConfig;
+
+/**
+ * executor template for local transaction which need global lock
+ * @author selfishlover
+ */
+public class GlobalLockTemplate {
+
+    public Object execute(GlobalLockExecutor executor) throws Throwable {
+        boolean alreadyInGlobalLock = RootContext.requireGlobalLock();
+        if (!alreadyInGlobalLock) {
+            RootContext.bindGlobalLockFlag();
+        }
+
+        // set my config to config holder so that it can be access in further execution
+        // for example, LockRetryController can access it with config holder
+        GlobalLockConfig myConfig = executor.getGlobalLockConfig();
+        GlobalLockConfig previousConfig = GlobalLockConfigHolder.setAndReturnPrevious(myConfig);
+
+        try {
+            return executor.execute();
+        } finally {
+            // only unbind when this is the root caller.
+            // otherwise, the outer caller would lose global lock flag
+            if (!alreadyInGlobalLock) {
+                RootContext.unbindGlobalLockFlag();
+            }
+
+            // if previous config is not null, we need to set it back
+            // so that the outer logic can still use their config
+            if (previousConfig != null) {
+                GlobalLockConfigHolder.setAndReturnPrevious(previousConfig);
+            } else {
+                GlobalLockConfigHolder.remove();
+            }
+        }
+    }
+}