add sharding-orchestration-center module in Orchestration 5.x (#3468)

* Add distributed lock center module

* In distributed lock center module, modify code style.

* Add sharding-orchestration-center.

* modify META-INF.services files in sharding-orchestration-center.

sharding-orchestration/pom.xml

@@ -33,5 +33,6 @@
         <module>sharding-orchestration-zookeeper-curator-integration-test</module>
         <module>sharding-orchestration-config</module>
         <module>sharding-orchestration-distributed-lock</module>
+        <module>sharding-orchestration-center</module>
     </modules>
 </project>

sharding-orchestration/sharding-orchestration-center/pom.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>sharding-orchestration</artifactId>
+        <groupId>org.apache.shardingsphere</groupId>
+        <version>4.0.0-RC3-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>sharding-orchestration-center</artifactId>
+    <name>${project.artifactId}</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.shardingsphere</groupId>
+            <artifactId>sharding-core-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.shardingsphere</groupId>
+            <artifactId>sharding-orchestration-reg-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-framework</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-client</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-recipes</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-test</artifactId>
+        </dependency>        
+    </dependencies>
+</project>

sharding-orchestration/sharding-orchestration-center/src/main/java/org/apache/shardingsphere/orchestration/center/api/ConfigCenter.java

@@ -0,0 +1,81 @@
+/*
+ * 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.shardingsphere.orchestration.center.api;
+
+import org.apache.shardingsphere.orchestration.center.configuration.OrchestrationConfiguration;
+import org.apache.shardingsphere.orchestration.center.listener.DataChangedEventListener;
+import org.apache.shardingsphere.spi.TypeBasedSPI;
+
+import java.util.List;
+
+/**
+ * Config center.
+ *
+ * @author zhangliang
+ * @author sunbufu
+ * @author dongzonglei
+ * @author wangguangyuan
+ */
+public interface ConfigCenter extends TypeBasedSPI {
+
+    /**
+     * Initialize config center.
+     * 
+     * @param config config center configuration
+     */
+    void init(OrchestrationConfiguration config);
+
+    /**
+     * Get data from config center.
+     * 
+     * <p>Maybe use cache if existed.</p>
+     * 
+     * @param key key of data
+     * @return value of data
+     */
+    String get(String key);
+
+    /**
+     * Get node's sub-nodes list.
+     *
+     * @param key key of data
+     * @return sub-nodes name list
+     */
+    List<String> getChildrenKeys(String key);
+
+    /**
+     * Persist data.
+     * 
+     * @param key key of data
+     * @param value value of data
+     */
+    void persist(String key, String value);
+
+    /**
+     * Watch key or path of the config server.
+     *
+     * @param key key of data
+     * @param dataChangedEventListener data changed event listener
+     */
+    void watch(String key, DataChangedEventListener dataChangedEventListener);
+
+    /**
+     * Close.
+      */
+    void close();
+}

sharding-orchestration/sharding-orchestration-center/src/main/java/org/apache/shardingsphere/orchestration/center/api/DistributedLockManagement.java

@@ -0,0 +1,82 @@
+/*
+ * 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.shardingsphere.orchestration.center.api;
+
+import org.apache.shardingsphere.orchestration.center.configuration.OrchestrationConfiguration;
+import org.apache.shardingsphere.spi.TypeBasedSPI;
+
+/**
+ * Distributed Lock center.
+ *
+ * @author zhangliang
+ * @author sunbufu
+ * @author dongzonglei
+ * @author wangguangyuan
+ */
+public interface DistributedLockManagement extends TypeBasedSPI {
+
+    /**
+     * Initialize distributed lock center.
+     *
+     * @param config distributed lock center configuration
+     */
+    void init(OrchestrationConfiguration config);
+
+    /**
+     * Get data from distributed lock center.
+     *
+     * <p>Maybe use cache if existed.</p>
+     *
+     * @param key key of data
+     * @return value of data
+     */
+    String get(String key);
+
+    /**
+     * Persist data.
+     *
+     * @param key key of data
+     * @param value value of data
+     */
+    void persist(String key, String value);
+
+    /**
+     * Close.
+     */
+    void close();
+
+    /**
+     * Initialize the lock of the key.
+     *
+     * @param key key of data
+     */
+    void initLock(String key);
+
+    /**
+     * Try to get the lock of the key.
+     *
+     * @return get the lock or not
+     */
+    boolean tryLock();
+
+    /**
+     * Try to release the lock of the key.
+     *
+     */
+    void tryRelease();
+}

sharding-orchestration/sharding-orchestration-center/src/main/java/org/apache/shardingsphere/orchestration/center/api/RegistryCenter.java

@@ -0,0 +1,90 @@
+/*
+ * 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.shardingsphere.orchestration.center.api;
+
+import org.apache.shardingsphere.orchestration.center.configuration.OrchestrationConfiguration;
+import org.apache.shardingsphere.orchestration.center.listener.DataChangedEventListener;
+import org.apache.shardingsphere.spi.TypeBasedSPI;
+
+import java.util.List;
+
+/**
+ * Registry center.
+ *
+ * @author zhangliang
+ * @author zhaojun
+ * @author sunbufu
+ * @author dongzonglei
+ * @author wangguangyuan
+ */
+public interface RegistryCenter extends TypeBasedSPI {
+
+    /**
+     * Initialize registry center.
+     * 
+     * @param config registry center configuration
+     */
+    void init(OrchestrationConfiguration config);
+
+    /**
+     * Get data from registry center.
+     * 
+     * <p>Maybe use cache if existed.</p>
+     * 
+     * @param key key of data
+     * @return value of data
+     */
+    String get(String key);
+
+    /**
+     * Get node's sub-nodes list.
+     *
+     * @param key key of data
+     * @return sub-nodes name list
+     */
+    List<String> getChildrenKeys(String key);
+
+    /**
+     * Persist data.
+     * 
+     * @param key key of data
+     * @param value value of data
+     */
+    void persist(String key, String value);
+
+    /**
+     * Persist ephemeral data.
+     *
+     * @param key key of data
+     * @param value value of data
+     */
+    void persistEphemeral(String key, String value);
+
+    /**
+     * Watch key or path of the registry.
+     *
+     * @param key key of data
+     * @param dataChangedEventListener data changed event listener
+     */
+    void watch(String key, DataChangedEventListener dataChangedEventListener);
+
+    /**
+     * Close.
+      */
+    void close();
+}