org.springframework.web.servlet.view.script

Class ScriptTemplateConfigurer

java.lang.Object

org.springframework.web.servlet.view.script.ScriptTemplateConfigurer

All Implemented Interfaces:

ScriptTemplateConfig

public class ScriptTemplateConfigurer
extends Object
implements ScriptTemplateConfig

An implementation of Spring MVC's ScriptTemplateConfig for creating a ScriptEngine for use in a web application.

 // Add the following to an @Configuration class
 @Bean
 public ScriptTemplateConfigurer mustacheConfigurer() {
    ScriptTemplateConfigurer configurer = new ScriptTemplateConfigurer();
    configurer.setEngineName("nashorn");
    configurer.setScripts("mustache.js");
    configurer.setRenderObject("Mustache");
    configurer.setRenderFunction("render");
    return configurer;
 }
 

NOTE: It is possible to use non thread-safe script engines with templating libraries not designed for concurrency, like Handlebars or React running on Nashorn, by setting the sharedEngine property to false.

Since:

4.2

Author:

Sebastien Deleuze

See Also:

ScriptTemplateView

Constructor Summary

Constructors

Constructor and Description
ScriptTemplateConfigurer()

Method Summary

Modifier and Type	Method and Description
Charset	getCharset() Return the charset used to read script and template files.
ScriptEngine	getEngine() Return the ScriptEngine to use by the views.
String	getEngineName() Return the engine name that will be used to instantiate the ScriptEngine.
String	getRenderFunction() Return the render function name (mandatory).
String	getRenderObject() Return the object where the render function belongs (optional).
String	getResourceLoaderPath() Return the resource loader path(s) via a Spring resource location.
String[]	getScripts() Return the scripts to be loaded by the script engine (library or user provided).
Boolean	isSharedEngine() Return whether to use a shared engine for all threads or whether to create thread-local engine instances for each thread.
void	setCharset(Charset charset) Set the charset used to read script and template files.
void	setEngine(ScriptEngine engine) Set the ScriptEngine to use by the view.
void	setEngineName(String engineName) Set the engine name that will be used to instantiate the ScriptEngine.
void	setRenderFunction(String renderFunction) Set the render function name (mandatory).
void	setRenderObject(String renderObject) Set the object where the render function belongs (optional).
void	setResourceLoaderPath(String resourceLoaderPath) Set the resource loader path(s) via a Spring resource location.
void	setScripts(String... scriptNames) Set the scripts to be loaded by the script engine (library or user provided).
void	setSharedEngine(Boolean sharedEngine) When set to false, use thread-local ScriptEngine instances instead of one single shared instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ScriptTemplateConfigurer

public ScriptTemplateConfigurer()

Method Detail

setEngine

public void setEngine(ScriptEngine engine)

Set the ScriptEngine to use by the view. The script engine must implement Invocable. You must define engine or engineName, not both.

When the sharedEngine flag is set to false, you should not specify the script engine with this setter, but with the setEngineName(String) one (since it implies multiple lazy instantiations of the script engine).

See Also:

setEngineName(String)

getEngine

public ScriptEngine getEngine()

Description copied from interface: ScriptTemplateConfig

Return the ScriptEngine to use by the views.

Specified by:

getEngine in interface ScriptTemplateConfig

setEngineName

public void setEngineName(String engineName)

Set the engine name that will be used to instantiate the ScriptEngine. The script engine must implement Invocable. You must define engine or engineName, not both.

See Also:

setEngine(ScriptEngine)

getEngineName

public String getEngineName()

Description copied from interface: ScriptTemplateConfig

Return the engine name that will be used to instantiate the ScriptEngine.

Specified by:

getEngineName in interface ScriptTemplateConfig

setSharedEngine

public void setSharedEngine(Boolean sharedEngine)

When set to false, use thread-local ScriptEngine instances instead of one single shared instance. This flag should be set to false for those using non thread-safe script engines with templating libraries not designed for concurrency, like Handlebars or React running on Nashorn for example. In this case, Java 8u60 or greater is required due to this bug.

When this flag is set to false, the script engine must be specified using setEngineName(String). Using setEngine(ScriptEngine) is not possible because multiple instances of the script engine need to be created lazily (one per thread).

See Also:

THREADING ScriptEngine parameter

isSharedEngine

public Boolean isSharedEngine()

Description copied from interface: ScriptTemplateConfig

Return whether to use a shared engine for all threads or whether to create thread-local engine instances for each thread.

Specified by:

isSharedEngine in interface ScriptTemplateConfig

setScripts

public void setScripts(String... scriptNames)

Set the scripts to be loaded by the script engine (library or user provided). Since resourceLoaderPath default value is "classpath:", you can load easily any script available on the classpath.

For example, in order to use a JavaScript library available as a WebJars dependency and a custom "render.js" file, you should call configurer.setScripts("/META-INF/resources/webjars/library/version/library.js", "com/myproject/script/render.js");.

See Also:

setResourceLoaderPath(java.lang.String), WebJars

getScripts

public String[] getScripts()

Description copied from interface: ScriptTemplateConfig

Return the scripts to be loaded by the script engine (library or user provided).

Specified by:

getScripts in interface ScriptTemplateConfig

setRenderObject

public void setRenderObject(String renderObject)

Set the object where the render function belongs (optional). For example, in order to call Mustache.render(), renderObject should be set to "Mustache" and renderFunction to "render".

getRenderObject

public String getRenderObject()

Description copied from interface: ScriptTemplateConfig

Return the object where the render function belongs (optional).

Specified by:

getRenderObject in interface ScriptTemplateConfig

setRenderFunction

public void setRenderFunction(String renderFunction)

Set the render function name (mandatory). This function will be called with the following parameters:

1. template: the view template content (String)
2. model: the view model (Map)

getRenderFunction

public String getRenderFunction()

Description copied from interface: ScriptTemplateConfig

Return the render function name (mandatory).

Specified by:

getRenderFunction in interface ScriptTemplateConfig

setCharset

public void setCharset(Charset charset)

Set the charset used to read script and template files. (UTF-8 by default).

getCharset

public Charset getCharset()

Description copied from interface: ScriptTemplateConfig

Return the charset used to read script and template files.

Specified by:

getCharset in interface ScriptTemplateConfig

setResourceLoaderPath

public void setResourceLoaderPath(String resourceLoaderPath)

Set the resource loader path(s) via a Spring resource location. Accepts multiple locations as a comma-separated list of paths. Standard URLs like "file:" and "classpath:" and pseudo URLs are supported as understood by Spring's ResourceLoader. Relative paths are allowed when running in an ApplicationContext.

Default is "classpath:".

getResourceLoaderPath

public String getResourceLoaderPath()

Description copied from interface: ScriptTemplateConfig

Return the resource loader path(s) via a Spring resource location.

Specified by:

getResourceLoaderPath in interface ScriptTemplateConfig