Zk

Author: t | 2025-04-24

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Show notification about the data.Syntaxget /path Sampleget /FirstZnodeOutput[zk: localhost:2181(CONNECTED) 1] get /FirstZnode“Myfirstzookeeper-app”cZxid = 0x7fctime = Tue Sep 29 16:15:47 IST 2015mZxid = 0x7fmtime = Tue Sep 29 16:15:47 IST 2015pZxid = 0x7fcversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 22numChildren = 0To access a sequential znode, you must enter the full path of the znode.Sampleget /FirstZnode0000000023Output[zk: localhost:2181(CONNECTED) 1] get /FirstZnode0000000023“Second-data”cZxid = 0x80ctime = Tue Sep 29 16:25:47 IST 2015mZxid = 0x80mtime = Tue Sep 29 16:25:47 IST 2015pZxid = 0x80cversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 13numChildren = 0WatchWatches show a notification when the specified znode or znode’s children data changes. You can set a watch only in get command.Syntaxget /path [watch] 1Sampleget /FirstZnode 1Output[zk: localhost:2181(CONNECTED) 1] get /FirstZnode 1“Myfirstzookeeper-app”cZxid = 0x7fctime = Tue Sep 29 16:15:47 IST 2015mZxid = 0x7fmtime = Tue Sep 29 16:15:47 IST 2015pZxid = 0x7fcversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 22numChildren = 0The output is similar to normal get command, but it will wait for znode changes in the background. Set DataSet the data of the specified znode. Once you finish this set operation, you can check the data using the get CLI command.Syntaxset /path /dataSampleset /SecondZnode Data-updatedOutput[zk: localhost:2181(CONNECTED) 1] get /SecondZnode “Data-updated”cZxid = 0x82ctime = Tue Sep 29 16:29:50 IST 2015mZxid = 0x83mtime = Tue Sep 29 16:29:50 IST 2015pZxid = 0x82cversion = 0dataVersion = 1aclVersion = 0ephemeralOwner = 0x15018b47db00000dataLength = 14numChildren = 0If you assigned watch option in get command (as in previous command), then the output will be similar as shown below −Output[zk: localhost:2181(CONNECTED) 1] get /FirstZnode “Mysecondzookeeper-app”WATCHER: :WatchedEvent state:SyncConnected type:NodeDataChanged path:/FirstZnodecZxid = 0x7fctime = Tue Sep 29 16:15:47 IST 2015mZxid = 0x84mtime = Tue Sep 29 17:14:47 IST 2015pZxid = 0x7fcversion = 0dataVersion = 1aclVersion = 0ephemeralOwner = 0x0dataLength = 23numChildren = 0Create Children / Sub-znodeCreating children is similar to creating new znodes. The only difference is that the path of the child znode will have the parent path as well.Syntaxcreate /parent/path/subnode/path /dataSamplecreate /FirstZnode/Child1 firstchildrenOutput[zk: localhost:2181(CONNECTED) 16] create /FirstZnode/Child1 “firstchildren”created /FirstZnode/Child1[zk: localhost:2181(CONNECTED) 17] create /FirstZnode/Child2 “secondchildren”created /FirstZnode/Child2List ChildrenThis command is used to list and display the children of a znode.Syntaxls /pathSamplels /MyFirstZnodeOutput[zk: localhost:2181(CONNECTED) 2] ls /MyFirstZnode[mysecondsubnode, myfirstsubnode]Check StatusStatus describes the metadata of a specified znode. It contains details such as Timestamp, Version number, ACL, Data length, and Children znode.Syntaxstat /pathSamplestat /FirstZnodeOutput[zk: localhost:2181(CONNECTED) 1] stat /FirstZnodecZxid = 0x7fctime = Tue Sep 29 16:15:47

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The ZooKeeper ensemble.The connect method will return the ZooKeeper object zk. Now, call the create method of zk object with custom path and data.The complete program code to create a znode is as follows −Coding: ZKCreate.javaimport java.io.IOException;import org.apache.zookeeper.WatchedEvent;import org.apache.zookeeper.Watcher;import org.apache.zookeeper.Watcher.Event.KeeperState;import org.apache.zookeeper.ZooKeeper;import org.apache.zookeeper.KeeperException;import org.apache.zookeeper.CreateMode;import org.apache.zookeeper.ZooDefs;public class ZKCreate { // create static instance for zookeeper class. private static ZooKeeper zk; // create static instance for ZooKeeperConnection class. private static ZooKeeperConnection conn; // Method to create znode in zookeeper ensemble public static void create(String path, byte[] data) throws KeeperException,InterruptedException { zk.create(path, data, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } public static void main(String[] args) { // znode path String path = "/MyFirstZnode"; // Assign path to znode // data in byte array byte[] data = "My first zookeeper app”.getBytes(); // Declare data try { conn = new ZooKeeperConnection(); zk = conn.connect("localhost"); create(path, data); // Create the data to the specified path conn.close(); } catch (Exception e) { System.out.println(e.getMessage()); //Catch error message } }}Once the application is compiled and executed, a znode with the specified data will be created in the ZooKeeper ensemble. You can check it using the ZooKeeper CLI zkCli.sh.cd /path/to/zookeeperbin/zkCli.sh>>> get /MyFirstZnodeExists – Check the Existence of a ZnodeThe ZooKeeper class provides the exists method to check the existence of a znode. It returns the metadata of a znode, if the specified znode exists. The signature of the exists method is as follows −exists(String path, boolean watcher)Where,path − Znode pathwatcher − boolean value to specify whether to watch a specified znode or notLet us create a new Java application to check the “exists” functionality of the ZooKeeper API. Create a file “ZKExists.java”. In the main method, create ZooKeeper object, “zk” using “ZooKeeperConnection” object. Then, call “exists” method of “zk” object with custom “path”. The complete listing is as follow −Coding: ZKExists.javaimport java.io.IOException;import org.apache.zookeeper.ZooKeeper;import org.apache.zookeeper.KeeperException;import org.apache.zookeeper.WatchedEvent;import org.apache.zookeeper.Watcher;import org.apache.zookeeper.Watcher.Event.KeeperState;import org.apache.zookeeper.data.Stat;public class ZKExists { private static ZooKeeper zk; private static ZooKeeperConnection conn; // Method to check existence of znode and its status, if znode is available. public static Stat znode_exists(String path) throws KeeperException,InterruptedException { return zk.exists(path, true); } public static void main(String[] args) throws InterruptedException,KeeperException { String path = "/MyFirstZnode"; // Assign znode to the specified path try { conn = new ZooKeeperConnection(); zk = conn.connect("localhost"); Stat stat = znode_exists(path); // Stat checks the path of the znode if(stat != null) { System.out.println("Node exists and the node version is " + stat.getVersion()); } else { System.out.println("Node does not

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Exists"); } } catch(Exception e) { System.out.println(e.getMessage()); // Catches error messages } }}Once the application is compiled and executed, you will get the below output.Node exists and the node version is 1.getData MethodThe ZooKeeper class provides getData method to get the data attached in a specified znode and its status. The signature of the getData method is as follows −getData(String path, Watcher watcher, Stat stat)Where,path − Znode path.watcher − Callback function of type Watcher. The ZooKeeper ensemble will notify through the Watcher callback when the data of the specified znode changes. This is one-time notification.stat − Returns the metadata of a znode.Let us create a new Java application to understand the getData functionality of the ZooKeeper API. Create a file ZKGetData.java. In the main method, create a ZooKeeper object zk using he ZooKeeperConnection object. Then, call the getData method of zk object with custom path.Here is the complete program code to get the data from a specified node −Coding: ZKGetData.javaimport java.io.IOException;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.ZooKeeper;import org.apache.zookeeper.KeeperException;import org.apache.zookeeper.WatchedEvent;import org.apache.zookeeper.Watcher;import org.apache.zookeeper.Watcher.Event.KeeperState;import org.apache.zookeeper.data.Stat;public class ZKGetData { private static ZooKeeper zk; private static ZooKeeperConnection conn; public static Stat znode_exists(String path) throws KeeperException,InterruptedException { return zk.exists(path,true); } public static void main(String[] args) throws InterruptedException, KeeperException { String path = "/MyFirstZnode"; final CountDownLatch connectedSignal = new CountDownLatch(1); try { conn = new ZooKeeperConnection(); zk = conn.connect("localhost"); Stat stat = znode_exists(path); if(stat != null) { byte[] b = zk.getData(path, new Watcher() { public void process(WatchedEvent we) { if (we.getType() == Event.EventType.None) { switch(we.getState()) { case Expired: connectedSignal.countDown(); break; } } else { String path = "/MyFirstZnode"; try { byte[] bn = zk.getData(path, false, null); String data = new String(bn, "UTF-8"); System.out.println(data); connectedSignal.countDown(); } catch(Exception ex) { System.out.println(ex.getMessage()); } } } }, null); String data = new String(b, "UTF-8"); System.out.println(data); connectedSignal.await(); } else { System.out.println("Node does not exists"); } } catch(Exception e) { System.out.println(e.getMessage()); } }}Once the application is compiled and executed, you will get the following outputMy first zookeeper appAnd the application will wait for further notification from the ZooKeeper ensemble. Change the data of the specified znode using ZooKeeper CLI zkCli.sh.cd /path/to/zookeeperbin/zkCli.sh>>> set /MyFirstZnode HelloNow, the application will print the following output and exit.HellosetData MethodThe ZooKeeper class provides setData method to modify the data attached in a specified znode. The signature of the setData method is as follows −setData(String path, byte[] data, int version)Where,path − Znode pathdata − data to store in a specified znode path.version − Current. The ZK Blog provides useful information on ZK and all of ZK products, such as ZK Calendar, ZK Studio and ZK Mobile! ZK Forum ZK Sandbox ZK Downloads. Documentation. LEARN ZK. ZK Documentation A collection of ZK tutorials, references, smalltalks and Javadocs.

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From CF Opportunity Fund Ltd., facilitated by Univest Securities, will empower ZKIN to explore new opportunities, expand its operations internationally, and fortify its position in the dynamic steel industry.A Pioneering Journey:Remaining steadfast in its commitment to innovation, excellence, and sustainable growth, ZK International Group Co., Ltd. welcomes this substantial passive investment from CF Opportunity Fund Ltd. Aligned with the Company's vision, this financing opens doors to a promising future. ZKIN eagerly anticipates the collaborative efforts that will help shape the future landscape of the steel industry.Mr. Jiancong Huang, Chairman of the Company, stated, "We are delighted by the trust placed in ZK International Group Co., Ltd. by the CF Opportunity Fund Ltd. This strategic financing not only strengthens our financial standing but also underscores the shared belief in our commitment to delivering cutting-edge solutions to its shareholders. With an above market pricing by the fund just solidifies that the Company is undervalued and has more foreseeable growth in the future.Mr. Chris Fraunenknecht, CEO of the CF Opportunity Fund Ltd., emphasizes, "that this passive investment is not intended for establishing control of ZKIN, but instead should signal that the fund is committed to a supportive role, fostering growth and innovation while respecting the existing leadership and strategic direction of ZK International Group Co., Ltd."For more information, please visit www.ZKInternationalGroup.com. Additionally, please follow the Company on Twitter, Facebook, YouTube, and Weibo. For further information on the Company's SEC filings please visit www.sec.gov.About ZK International Group Co., Ltd.:ZK International Group Co., Ltd. is a China-based engineering company building and investing in innovative technologies for the modern world. With a focus on designing and implementing next-generation solutions through industrial, environmental and software engineering, ZKIN owns 28 patents, 21 trademarks, 2 Technical Achievement Awards, and 10 National and Industry Standard Awards. ZKIN's core business is to engineer and manufacture patented high-performance stainless steel and carbon steel pipe products that effectively deliver high quality, highly-sustainable and environmentally sound drinkable water to the Chinese, Asia and European markets. ZK International is Quality Management System Certified (ISO9001), Environmental Management System Certified (ISO1401), and a National Industrial Stainless Steel

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Production Licensee. It has supplied stainless steel pipelines for over 2,000 projects, which include the Beijing National Airport, the "Water Cube" and "Bird's Nest", which were venues for the 2008 Beijing Olympics. ZK International is preparing to capitalize on the $850 Billion commitment made by the Chinese Government to improve the quality of water, which has been stated to be 70% unfit for human contact. Safe Harbor Statement This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and as defined in the U.S. Private Securities Litigation Reform Act of 1995. Without limiting the generality of the foregoing, words such as "may," "will," "expect," "believe," "anticipate," "intend," "could," "estimate" or "continue" or the negative or other variations thereof or comparable terminology are intended to identify forward-looking statements. In addition, any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements. These forward-looking statements are not guarantees of future performance and are subject to certain risks, uncertainties and assumptions that are difficult to predict and many of which are beyond the control of ZK International. Actual results may differ from those projected in the forward-looking statements due to risks and uncertainties, as well as other risk factors that are included in the Company's filings with the U.S. Securities and Exchange Commission. Although ZK International believes that the assumptions underlying the forward-looking statements are reasonable, any of the assumptions could prove inaccurate and, therefore, there can be no assurance that the results contemplated in forward-looking statements will be realized. In light of the significant uncertainties inherent in the forward-looking information included herein, the inclusion of such information should not be regarded as a representation by ZK International or any other person that their objectives or plans will be achieved. ZK International does not undertake any obligation to revise the forward-looking statements contained herein to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.SOURCE ZK International Group

zk/zkdoc/release-note at master zkoss/zk - GitHub

OSGI integration. RAP applications are written in Java, therefore well known IDEs like Eclipse can be used effectively. RAP is a project of the Eclipse Foundation. RichFaces RichFaces is an advanced AJAX framework for business applications using Java Server Faces (JSF). It provides a full set of AJAX enabled components and comes with an own IDE called CDK. RichFaces is a JBoss project, licensed under LGPL. The well known US company Red Hat Inc. owns this project. ZK-Framework ZK adds a comprehensive set of enterprise components and building blocks on top of the de facto standards jQuery and JSON. ZK provides developers with an event-driven model and implementation in pure Java or XML markup. Potix Corporation is the company behind this framework with offices in Taiwan and Canada. Smart GWT Smart GWT of Isomorphic Software combines a large set of Google Web Toolkit (GWT) UI components with a Java server framework to create business web applications. Adaption of the browser to different devices is of course included and on one single code base. Fluent UI React Microsoft's Fluent UI React is the official open-source React front-end framework designed to build experiences that fit seamlessly into a broad range of Microsoft products. It provides robust, up-to-date, accessible components which are highly customizable using CSS-in-JS.. The ZK Blog provides useful information on ZK and all of ZK products, such as ZK Calendar, ZK Studio and ZK Mobile!