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Creating an Implementation of Shipping Calculation API

Creating an Implementation of Shipping Calculation API

Elastic Path provides new plugins, such as shipping-calculation-connectivity-api and shipping-calculation-plugin-epcommerce, to support shipping calculation API framework. The shipping-calculation-connectivity-api bundle defines the interfaces that a new plugin needs to implement. The custom plugin replaces the shipping-calculation-plugin-epcommerce bundle.

To implement a new plugin, you must replace the following dependency with the new dependencies in the cortex and cm-libs module's POM.xml:
<dependency>
 <groupId>com.elasticpath</groupId>
 <artifactId>shipping-calculation-plugin-epcommerce</artifactId>
 </dependency>
 <dependency>
 <groupId>com.elasticpath</groupId>
 <artifactId>shipping-calculation-epcommerce</artifactId>
 </dependency>
  1. Create a new module in the extensions module for your shipping calculation API called Shipping Calculation Plugins: 
    <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <parent>
      <groupId>com.elasticpath.extensions</groupId>
      <artifactId>ext-commerce-engine-parent</artifactId>
      <version>0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
   <name>Shipping Calculation Plugins</name>
   <artifactId>ext-shipping-calculation-plugins-parent</artifactId>
   <packaging>pom</packaging>
 
   <modules>
      <module>Name of the custom plugin folder</module>
   </modules>
</project>
  2. Add Shipping Calculation Plugins as a module in the extensions/pom.xml file.
  3. Create a directory within the Shipping Calculation Plugins directory for your specific plugin, such as custom_shipping_calculation_plugin.
  4. Add the following POM file to the plugin: 
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<artifactId>core</artifactId>
		<groupId>com.elasticpath</groupId>
		<version>0-SNAPSHOT</version>
	</parent>


	<name>EP Shipping Calculation Plugin</name>

	<dependencies>
		<dependency>
			<groupId>com.elasticpath</groupId>
			<artifactId>ep-money</artifactId>
		</dependency>
		<dependency>
			<groupId>com.elasticpath</groupId>
			<artifactId>shipping-calculation-connectivity-api</artifactId>
		</dependency>
		<dependency>
			<groupId>com.elasticpath</groupId>
			<artifactId>shipping-calculation-epcommerce</artifactId>
		</dependency>

		<dependency>
			<groupId>commons-collections</groupId>
			<artifactId>commons-collections</artifactId>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
		</dependency>

		<dependency>
			<groupId>com.elasticpath</groupId>
			<artifactId>ep-test-utils</artifactId>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>org.assertj</groupId>
			<artifactId>assertj-core</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mockito</groupId>
			<artifactId>mockito-core</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-checkstyle-plugin</artifactId>
			</plugin>
			<plugin>
				<artifactId>maven-pmd-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-bundle-plugin</artifactId>
				<extensions>true</extensions>
			</plugin>
		</plugins>
	</build>
</project>
  5. Create standard Maven directories in the following structure in this module: 
    src/
  main/
    java/
    resources/
  test/
    java/
    resources/
  6. Create a class to extend AbstractShippingCalculationPlugin. 
    /*
package com.elasticpath.shipping.connectivity.spi;

import java.io.Serializable;

import com.elasticpath.shipping.connectivity.spi.capability.ShippingCalculationCapability;

/**
 * Service Provider Interface for extension classes implementing shipping calculation plugins.
 */
public abstract class AbstractShippingCalculationPlugin implements ShippingCalculationPlugin, Serializable {
	/**
	 * Serial Version UID.
	 */
	private static final long serialVersionUID = 1L;

	@Override
	public <T extends ShippingCalculationCapability> T getCapability(final Class<T> capability) {
		if (hasCapability(capability)) {
			return capability.cast(this);
		}
		return null;
	}

	@Override
	public <T extends ShippingCalculationCapability> boolean hasCapability(final Class<T> capability) {
		return capability.isAssignableFrom(this.getClass());
	}

}
  7. Implement ShippingCostCalculationCapability, ShippingOptionListCapability, ShippingOptionListAllCapability, and ShippingOptionListPerDestinationCapability.
    Implement shipping calculation capability as in the following example:
    public Money calculateShippingCost(final ShippingServiceLevel shippingServiceLevel,
										  final Collection<? extends ShippableItem> shippableItems,
										  final Money shippableItemsSubtotal,
										  final Currency currency) {
		return shippingServiceLevel.getShippingCostCalculationMethod()
				.calculateShippingCost(shippableItems, shippableItemsSubtotal, currency, productSkuLookup);
	}
  8. Add the plugin into the Cortex and Commerce Manager modules.