DefaultModuleDeploymentPropertiesProvider.java

/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.xd.dirt.server.admin.deployment.zk;

import java.util.HashMap;
import java.util.Map;

import org.springframework.xd.dirt.core.DeploymentUnit;
import org.springframework.xd.dirt.server.admin.deployment.ModuleDeploymentPropertiesProvider;
import org.springframework.xd.dirt.util.DeploymentPropertiesUtility;
import org.springframework.xd.module.ModuleDeploymentProperties;
import org.springframework.xd.module.ModuleDescriptor;


/**
 * Default implementation that retrieves the {@link ModuleDeploymentProperties} for the given
 * {@link ModuleDescriptor}.
 *
 * @author Ilayaperumal Gopinathan
 */
public class DefaultModuleDeploymentPropertiesProvider implements
		ModuleDeploymentPropertiesProvider<ModuleDeploymentProperties> {

	/**
	 * Cache of module deployment properties.
	 */
	private final Map<ModuleDescriptor.Key, ModuleDeploymentProperties> mapDeploymentProperties =
			new HashMap<ModuleDescriptor.Key, ModuleDeploymentProperties>();

	/**
	 * DeploymentUnit (stream/job) to create module deployment properties for.
	 */
	private final DeploymentUnit deploymentUnit;

	/**
	 *
	 * @param deploymentUnit deployment unit (stream/job) to create module properties for
	 */
	public DefaultModuleDeploymentPropertiesProvider(DeploymentUnit deploymentUnit) {
		this.deploymentUnit = deploymentUnit;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public ModuleDeploymentProperties propertiesForDescriptor(ModuleDescriptor moduleDescriptor) {
		ModuleDescriptor.Key key = moduleDescriptor.createKey();
		ModuleDeploymentProperties properties = mapDeploymentProperties.get(key);
		if (properties == null) {
			properties = DeploymentPropertiesUtility.createModuleDeploymentProperties(
					deploymentUnit.getDeploymentProperties(), moduleDescriptor);
			mapDeploymentProperties.put(key, properties);
		}
		return properties;
	}
}