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Creating Service Wrappers

With Service Wrappers, you can override default service methods to add extra functionality. For example, you may want the value of a field you’ve added to Liferay’s User object to be saved whenever the Liferay API’s addUser or updateUser methods are called. Liferay’s service wrappers provide easy-to-use extension points for customizing Liferay’s services.

Deploying a Service Wrapper

Start a new Liferay instance by running

docker run -it -m 8g -p 8080:8080 liferay/portal:7.4.3.112-ga112

Sign in to Liferay at http://localhost:8080. Use the email address test@liferay.com and the password test. When prompted, change the password to learn.

Then, follow these steps to deploy the example:

Download and unzip the liferay-j1c2.zip example project.

curl https://resources.learn.liferay.com/dxp/latest/en/liferay-development/liferay-internals/extending-liferay/liferay-j1c2.zip -O

unzip liferay-j1c2.zip

Build and deploy the project module.
```
cd liferay-j1c2
```
```
./gradlew deploy -Ddeploy.docker.container.id=$(docker ps -lq)
```
Note

This command is the same as copying the deployed jars to /opt/liferay/osgi/modules on the Docker container.
Confirm the deployment in the Liferay Docker container console.
```
STARTED com.acme.j1c2.impl_1.0.0 [1439]
```
To verify the example module’s customization, open your browser to https://localhost:8080.

Log out of Liferay and log back in. The service wrapper prints this message to the Liferay Docker container console:

INFO  [http-nio-8080-exec-6][J1C2UserLocalServiceWrapper:25] Invoking #authenticateByEmailAddress(long, String, String, Map, Map, Map)

This example prints a message to the console whenever the authenticateByEmailAddress method is called.

Creating a Service Wrapper Class

Choose the service you want to wrap. This example creates a service wrapper for UserLocalService, so it extends UserLocalServiceWrapper:

Annotate the class so Liferay knows this is a service wrapper component.

public class J1C2UserLocalServiceWrapper extends UserLocalServiceWrapper {

Choose the method you want to override and add your own implementation.

public int authenticateByEmailAddress(
		long companyId, String emailAddress, String password,
		Map<String, String[]> headerMap, Map<String, String[]> parameterMap,
		Map<String, Object> resultsMap)
	throws PortalException {

	if (_log.isInfoEnabled()) {
		_log.info(
			"Invoking #authenticateByEmailAddress(long, String, String, " +
				"Map, Map, Map)");
	}

	return super.authenticateByEmailAddress(
		companyId, emailAddress, password, headerMap, parameterMap,
		resultsMap);
}

Overriding a Method

Open the J1C2UserLocalServiceWrapper class in your text editor or IDE.
Inside the class, create a public method called getUser. This overrides UserLocalService’s getUser method. As such, it must pass a long as an argument and return a User. This method should also throw a PortalException. Make sure to add the @Override annotation.
```
@Override
public User getUser(long userId) throws PortalException {
}
```
Since this method returns the User object, import it at the top of the file.
```
import com.liferay.portal.kernel.model.User;
```
Create a similar method to the one in the example so that every time the getUser method is called, it prints a message to the console.
```
if (_log.isInfoEnabled()) {
    _log.info(
        "Invoking #getUser(long)");
}
```
You still want getUser to be called, so make the method return the results of calling getUser’s super method.
```
return super.getUser(userId);
```

In the end, your method should look like this:

@Override
public User getUser(long userId) throws PortalException {
    if (_log.isInfoEnabled()) {
        _log.info(
            "Invoking #getUser(long)");
    }

    return super.getUser(userId);
}

Build and deploy your module.

./gradlew build deploy -Ddeploy.docker.container.id=$(docker ps -lq)

Testing Your Service Wrapper

Go back to https://localhost:8080.
Click My Profile in the User menu. This takes you to your profile page.
When you open your profile page, Liferay calls the getUser method a couple times. Check your console for the following message:

INFO  [http-nio-8080-exec-4][J1C2UserLocalServiceWrapper:39] Invoking #getUser(long)

Congratulations! You’ve customized a service’s methods using a Liferay service wrapper.

Creating Service Wrappers

Deploying a Service Wrapper

Creating a Service Wrapper Class

Overriding a Method

Testing Your Service Wrapper

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