Using Custom ZK Scopes For Spring Beans"

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Use ZK custom scope for Spring beans.
 
Use ZK custom scope for Spring beans.
 
===Example===
 
===Example===
In this example we will present user to enter a message which can be set into a Spring bean. This bean is set to custom ZK Spring <tt>desktop</tt> scope<ref>Besides <tt>desktop</tt> scope, ZK Spring also support <tt>webapp</tt>-, <tt>page</tt>-, <tt>idspace</tt>- and <tt>execution</tt>-scope</ref> so that it can be shared by other pages that are attached to this same desktop.
+
In this example, we will present user to enter a message which can be set into a Spring bean in a (custom) desktop scope. In addition to desktop scope, ZK Spring also supports <code>webapp</code> and <code>execution</code> scope (<code>page</code> scope, <code>idspace</code> scope have been deprecated). So that it can be shared by other pages, controllers, and view models attached to this same desktop.
<references/>
 
  
 
===Configuration===
 
===Configuration===
  
==== Java Config ====
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To enable the custom ZK scopes for your Spring Beans all you need is to add the <code><zksp:zk-config/></code> element (and namespace declaration) to your spring bean configuration file  or use Java Config as shown below.
  
<source lang="java" high="4">
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==== Java Config (since 4.0.0) ====
 +
 
 +
<source lang="java" highlight="4">
 
import org.zkoss.spring.config.ZkScopesConfigurer;
 
import org.zkoss.spring.config.ZkScopesConfigurer;
  
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==== XML Config ====
 
==== XML Config ====
  
<source lang="xml" high="4,6,9">
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<source lang="xml" highlight="4,6,9">
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?xml version="1.0" encoding="UTF-8"?>
 
<beans xmlns="http://www.springframework.org/schema/beans"
 
<beans xmlns="http://www.springframework.org/schema/beans"
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==== Previous version 3.2 (or earlier) ====
 
==== Previous version 3.2 (or earlier) ====
  
To enable ZK custom scopes for your Spring Beans all you need is to add <code><zk-config/></code> element to your spring bean configuration file. Here is snippet from our sample application configuration
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<source lang="xml" highlight="4,6,9">
<source lang="xml" high="5,9,12">
 
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?xml version="1.0" encoding="UTF-8"?>
 
<beans xmlns="http://www.springframework.org/schema/beans"
 
<beans xmlns="http://www.springframework.org/schema/beans"
 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
 
 
     xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
 
     xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
 
 
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
 
 
             http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core.xsd">
 
             http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core.xsd">
  
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===ZUML===
 
===ZUML===
 
Let's take a look at the main page source
 
Let's take a look at the main page source
<source lang="xml" high="4">
+
<source lang="xml" highlight="4">
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
 
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
 
<window title="Custom Scopes Example - Main Page" border="normal" height="100px" width="400px"  
 
<window title="Custom Scopes Example - Main Page" border="normal" height="100px" width="400px"  
     apply="${scopesCtrl}">
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     apply="${scopedCtrl}">
 
     <label value="Enter Message Text:"></label>
 
     <label value="Enter Message Text:"></label>
 
     <textbox id="name" />
 
     <textbox id="name" />
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It has one textbox to enter a message. On clicking Set button we store this text in a <code>SimpleMessageBean</code> which is Autowired into scopesCtrl controller.
 
It has one textbox to enter a message. On clicking Set button we store this text in a <code>SimpleMessageBean</code> which is Autowired into scopesCtrl controller.
 +
 +
'''ATTENTION''': As seen below the "scopedCtrl"-controller has the "prototype"-scope. This implies that a new instance is created every time you resolve it by name, even in the same page. However you can still reference the exact same instance using [[ZK_Developer%27s_Reference/MVC/Controller/Composer#Retrieve_Composer_in_EL_Expressions | an implicit variable]].
  
 
===Java===
 
===Java===
Here is the SimpleMessageBean source and you can see its scope is set to "desktop" scope using <code>Scope</code> annotation.
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The SimpleMessageBean is set to "desktop"-scope using the <code>@Scope</code>.
 
<source lang="java">
 
<source lang="java">
 
@Component("msgBean")
 
@Component("msgBean")
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</source>
 
</source>
  
Here is the controller source in which SimpleMessageBean is autowired.
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Being a "prototype"-scoped bean the controller can use <code>@Autowired</code> to get the SimpleMessageBean injected.
  
<source lang="java">
+
<source lang="java" highlight="2,5,6,23">
 
@Component("scopedCtrl")
 
@Component("scopedCtrl")
@Scope("prototype")
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@Scope("desktop")
 
public class ScopedController extends SelectorComposer {
 
public class ScopedController extends SelectorComposer {
  
     @AutoWired
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     @Autowired
 
     private SimpleMessageBean msgBean; //wire spring bean
 
     private SimpleMessageBean msgBean; //wire spring bean
  
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</source>
 
</source>
  
Now when you click Show window button on the main page it creates a new page called customScopesWindow.zul and attaches it to the current desktop. Here is the source code for this page
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The onClick listener of the "Show Window"-button (above line 21-25), append "customScopesWindow.zul" (code below) to the current desktop.
<source lang="xml">
+
 
 +
<source lang="xml" highlight="6">
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
 
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
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Since it is attached to the same desktop we have access SimpleMessageBean instance stored in the desktop scope. We use our standard approach to use DelegatingVariableResolver to access such bean and assign its value to a textbox.
 
Since it is attached to the same desktop we have access SimpleMessageBean instance stored in the desktop scope. We use our standard approach to use DelegatingVariableResolver to access such bean and assign its value to a textbox.
  
=Version History=
+
 
{{LastUpdated}}
 
{| border='1px' | width="100%"
 
! Version !! Date !! Content
 
|-
 
| &nbsp;
 
| &nbsp;
 
| &nbsp;
 
|}
 
 
{{ZKSpringEssentialsPageFooter}}
 
{{ZKSpringEssentialsPageFooter}}

Latest revision as of 08:50, 13 December 2022

Using Custom ZK Scopes For Spring Beans



Purpose

Use ZK custom scope for Spring beans.

Example

In this example, we will present user to enter a message which can be set into a Spring bean in a (custom) desktop scope. In addition to desktop scope, ZK Spring also supports webapp and execution scope (page scope, idspace scope have been deprecated). So that it can be shared by other pages, controllers, and view models attached to this same desktop.

Configuration

To enable the custom ZK scopes for your Spring Beans all you need is to add the <zksp:zk-config/> element (and namespace declaration) to your spring bean configuration file or use Java Config as shown below.

Java Config (since 4.0.0)

import org.zkoss.spring.config.ZkScopesConfigurer;

@Configuration
@Import(ZkScopesConfigurer.class)
public class YourApplicationConfiguration {
    ...
}

XML Config

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core-4.0.xsd">

	<!-- Enables ZK custom scopes for Spring Beans -->
	<zksp:zk-config/>
</beans>

Previous version 3.2 (or earlier)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core.xsd">

    <!-- Enables ZK custom scopes for Spring Beans -->
    <zksp:zk-config/>
...

Note that you need to declare ZK Spring Core namespace at the start of your configuration file.

ZUML

Let's take a look at the main page source

<?xml version="1.0" encoding="UTF-8"?>
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
<window title="Custom Scopes Example - Main Page" border="normal" height="100px" width="400px" 
    apply="${scopedCtrl}">
    <label value="Enter Message Text:"></label>
    <textbox id="name" />
    <button id="setMsgBtn" label="Set" />
    <button id="showMsgBtn" label="Show Message" />
    <button id="showWinBtn" label="Show Window" />
</window>

It has one textbox to enter a message. On clicking Set button we store this text in a SimpleMessageBean which is Autowired into scopesCtrl controller.

ATTENTION: As seen below the "scopedCtrl"-controller has the "prototype"-scope. This implies that a new instance is created every time you resolve it by name, even in the same page. However you can still reference the exact same instance using an implicit variable.

Java

The SimpleMessageBean is set to "desktop"-scope using the @Scope.

@Component("msgBean")
@Scope("desktop")
public class SimpleMessageBean {

    private String msg;
    
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

Being a "prototype"-scoped bean the controller can use @Autowired to get the SimpleMessageBean injected.

@Component("scopedCtrl")
@Scope("desktop")
public class ScopedController extends SelectorComposer {

    @Autowired
    private SimpleMessageBean msgBean; //wire spring bean

    @Wired
    private Textbox name; //wire ZK component

    @Listen("onClick = #setMsgBtn")
    public void setMessage(Event evt) {
        msgBean.setMsg(name.getValue());
    }
    
    @Listen("onClick = #showMsgBtn")
    public void showMessage(Event evt) throws InterruptedException {
        Messagebox.show(msgBean.getMsg());
    }

    @Listen("onClick = #showWinBtn")
    public void showMessage(Event evt) throws InterruptedException {
        Window win = (Window) Executions.getCurrent().createComponents("customScopesWindow.zul", null, null);
        win.doHighlighted();
    }
}

The onClick listener of the "Show Window"-button (above line 21-25), append "customScopesWindow.zul" (code below) to the current desktop.

<?xml version="1.0" encoding="UTF-8"?>
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
<window title="Custom Scopes Example - Window Page" border="normal" height="100px"
    width="400px" closable="true">
    <label value="Message Text:"></label>
    <textbox id="name" value="${msgBean.msg}"/>
</window>

Since it is attached to the same desktop we have access SimpleMessageBean instance stored in the desktop scope. We use our standard approach to use DelegatingVariableResolver to access such bean and assign its value to a textbox.



Last Update : 2022/12/13

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