create snowflake

sharding-core/src/main/java/io/shardingsphere/api/config/rule/KeyGeneratorConfiguration.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2016-2018 shardingsphere.io.
+ * <p>
+ * 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.
+ * </p>
+ */
+package io.shardingsphere.api.config.rule;
+
+import io.shardingsphere.core.constant.KeyGeneratorEnum;
+import lombok.Builder;
+import lombok.Data;
+
+/**
+ * @author:zhaodong.xzd
+ * @github https://github.com/Yaccc
+ */
+@Data
+@Builder
+public class KeyGeneratorConfiguration implements RuleConfiguration {
+    private KeyGeneratorEnum keyGeneratorType;
+
+
+}

sharding-core/src/main/java/io/shardingsphere/core/constant/KeyGeneratorEnum.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2016-2018 shardingsphere.io.
+ * <p>
+ * 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.
+ * </p>
+ */
+package io.shardingsphere.core.constant;
+
+import lombok.RequiredArgsConstructor;
+
+/**
+ * @author:zhaodong.xzd
+ * @github https://github.com/Yaccc
+ */
+@RequiredArgsConstructor
+public enum KeyGeneratorEnum {
+    /**
+     * default snowflake
+     */
+    DEFAULT("default"),
+    /**
+     * leaf snowflake with zookeeper
+     */
+    LEAF_SNOWFLAKE("leaf_snowflake"),
+    /**
+     * leaf segement
+     */
+    LEAF_SEGMENT("leaf_segment");
+
+    private final String typeName;
+
+}

sharding-core/src/main/java/io/shardingsphere/core/keygen/leaf/SnowFlakeKeyGenerator.java

@@ -1,7 +1,30 @@
+/*
+ * Copyright 2016-2018 shardingsphere.io.
+ * <p>
+ * 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.
+ * </p>
+ */
 package io.shardingsphere.core.keygen.leaf;
 
 import io.shardingsphere.core.keygen.KeyGenerator;
 
+/**
+ * snowflake from leaf
+ *
+ * @url https://github.com/Meituan-Dianping/Leaf
+ * @author:zhaodong.xzd
+ *
+ */
 public class SnowFlakeKeyGenerator implements KeyGenerator {
     @Override
     public Number generateKey() {