net.hasor.dataql.fx.basic.StateUdfSource Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or authors.
*
* 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 net.hasor.dataql.fx.basic;
import net.hasor.dataql.Udf;
import net.hasor.dataql.UdfSourceAssembly;
import javax.inject.Singleton;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;
/**
* 状态函数 import 'net.hasor.dataql.fx.basic.StateUdfSource' as state;
* @author 赵永春 ([email protected])
* @version : 2019-12-12
*/
@Singleton
public class StateUdfSource implements UdfSourceAssembly {
/** 返回一个Udf，每次调用这个UDF，都会返回一个 Number。Number值较上一次会自增 1。 */
public static Udf decNumber(long initValue) {
AtomicLong atomicLong = new AtomicLong(initValue);
return (params, readOnly) -> atomicLong.incrementAndGet();
}
/** 返回一个Udf，每次调用这个UDF，都会返回一个 Number。Number值较上一次会自减 1。 */
public static Udf incNumber(long initValue) {
AtomicLong atomicLong = new AtomicLong(initValue);
return (params, readOnly) -> atomicLong.decrementAndGet();
}
/** 返回一个完整格式的 UUID 字符串。 */
public static String uuid() {
return UUID.randomUUID().toString();
}
/** 返回一个不含"-" 符号的 UUID 字符串 */
public static String uuidToShort() {
return UUID.randomUUID().toString().replace("-", "");
}
}