Grails Link Generator | Generate Links Outside Controllers or Tag Libraries | Using grailsLinkGenerator to generate link | Custom Link Generator
It's easy, just need to follow below steps:
First create a properties file named "application.properties" under web-app/WEB-INF as follows:
configs.serverURL=http://localhost:8033/custom-link-generator-bean
Now create a Groovy file named "ConfigurationProperties.groovy" with below contents:
package com.link import grails.util.Environment /** * Created by pritom on 23/10/2017. */ class ConfigurationProperties { public static final String DEV_DIR = "web-app/WEB-INF" private static Properties ppt static getProperty(String name, def defaultV = null) { if (ppt == null) { ppt = new Properties() loadProperties("application.properties") } def result = ppt.getProperty(name, defaultV?.toString()) return result == "" ? defaultV : result } static loadProperties(String fileName) { URL url = ConfigurationProperties.class.getResource("ConfigurationProperties.class") String thisPath = url.getPath(), path if(Environment.current == Environment.DEVELOPMENT || Environment.current == Environment.TEST) { path = "file://" + thisPath.substring(0, thisPath.lastIndexOf("target")) + "${DEV_DIR}/${fileName}" } else { path = "file://" + thisPath.substring(0, thisPath.lastIndexOf("classes")) + fileName } new File(path.toURI()).getCanonicalFile().withInputStream { InputStream stream -> ppt.load(stream) } } }
Now create a Groovy file named "MyLinkGenerator.groovy" with below contents:
package com.link import org.codehaus.groovy.grails.web.mapping.DefaultLinkGenerator import org.codehaus.groovy.grails.web.mapping.LinkGenerator /** * Created by pritom on 23/10/2017. */ class MyLinkGenerator extends DefaultLinkGenerator implements LinkGenerator { MyLinkGenerator(String serverBaseURL, String contextPath) { super(serverBaseURL, contextPath) } MyLinkGenerator(String serverBaseURL) { super(serverBaseURL) } String makeServerURL() { return ConfigurationProperties.getProperty("configs.serverURL") } String link(Map attrs, String encoding = 'UTF-8') { String cp = super.getContextPath() String url = super.link(attrs, encoding) if (cp) { if (cp != null && url.startsWith(cp)) url = url.substring(cp.length()) if (url.startsWith("/")) url = url.substring(1) return makeServerURL() + "/" + url } return url } }
Now add below lines to BootStrap.groovy
import com.link.MyLinkGenerator import grails.spring.BeanBuilder import org.codehaus.groovy.grails.commons.GrailsApplication import javax.servlet.ServletContext class BootStrap { ServletContext servletContext GrailsApplication grailsApplication def init = { servletContext -> grailsApplication.mainContext.removeBeanDefinition("grailsLinkGenerator") BeanBuilder bb = new BeanBuilder() bb.beans { grailsLinkGenerator(MyLinkGenerator, null) } bb.registerBeans(grailsApplication.mainContext) } def destroy = { } }
And create another Groovy file named "AsyncManager.groovy" with below contents to check it in thread:
package com.link /** * Created by pritom on 23/10/2017. */ class AsyncManager { static void run(Closure closure) { TimerTask task = new TimerTask() { @Override void run() { try { closure.call() } catch (Exception e) { e.printStackTrace() } } } new Timer().schedule(task, 1000L) } }
And finally add a controller with below contents:
package com.link class CustomLinkController { def grailsLinkGenerator def index() { println "In-request" println "Generator=${grailsLinkGenerator.class}" println "Base-url=${grailsLinkGenerator.serverBaseURL}" println "Controller-url=${grailsLinkGenerator.link(controller: "customLink", action: "index", params: [id: 2, name: "Pritom Kumar"])}" AsyncManager.run { println "" println "In-non-request" println "Generator=${grailsLinkGenerator.class}" println "Base-url=${grailsLinkGenerator.serverBaseURL}" println "Controller-url=${grailsLinkGenerator.link(controller: "customLink", action: "index", params: [id: 2, name: "Pritom Kumar"])}" } render "" } }
Output would be as follows:
--------------WITHOUT CUSTOM LINK GENERATOR----------------------- In-request Generator=class asset.pipeline.grails.CachingLinkGenerator Base-url=http://localhost:8033/custom-link-generator-bean Controller-url=/custom-link-generator-bean/customLink/index/2?name=Pritom+Kumar In-non-request Generator=class asset.pipeline.grails.CachingLinkGenerator Base-url=http://localhost:8080/custom-link-generator-bean Controller-url=/custom-link-generator-bean/customLink/index/2?name=Pritom+Kumar --------------WITH CUSTOM LINK GENERATOR----------------------- In-request Generator=class com.link.MyLinkGenerator Base-url=http://localhost:8033/custom-link-generator-bean Controller-url=http://localhost:8033/custom-link-generator-bean/customLink/index/2?name=Pritom+Kumar In-non-request Generator=class com.link.MyLinkGenerator Base-url=http://localhost:8033/custom-link-generator-bean Controller-url=http://localhost:8033/custom-link-generator-bean/customLink/index/2?name=Pritom+Kumar
Such a nice article
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