map 缓存方法的使用

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;



public class OrganizationCached {
    
    public static OrganizationCached instance = null;
    
    private static Map<String, Organization> organizationMap = new LinkedHashMap<String, Organization>();

    private OrganizationCached() {

    }

    public static OrganizationCached getInstance() {
        if (null == instance) {
            return new OrganizationCached();
        }
        return instance;
    }

    public static void clear() {
        organizationMap.clear();
    }

    public void put(Organization organization) {
        organizationMap.put(String.valueOf(organization.getId()), organization);
    }

    
    public void putAll(List<Organization> organizationList) {
        if (!CollectionUtils.isEmpty(organizationList)) {
            for (Organization organization : organizationList) {
                organizationMap.put(String.valueOf(organization.getId()), organization);
            }
        }
    }

    public Organization get(String key) {
        return organizationMap.get(key);
    }

    
    public Map<String, Organization> getAll() {
        return organizationMap;
    }

    public void remove(String key) {
        organizationMap.remove(key);
    }

    public void remove(List<String> keys) {
        if (CollectionUtils.isEmpty(keys)) {
            return;
        }
        for (String key : keys) {
            organizationMap.remove(key);
        }
    }
}