Liferay 启动过程分析14-初始化resource code

在MainServlet中，当初始化resource actions之后，就开始初始化resource code ,这是由以下代码来完成的：

if (_log.isDebugEnabled()) {
_log.debug("Initialize resource codes");
}

try {
initResourceCodes(portlets);
}
..

它会去调用initResourceCodes方法：

protected void initResourceCodes(List<Portlet> portlets) throws Exception {
long[] companyIds = PortalInstances.getCompanyIdsBySQL();

Iterator<Portlet> itr = portlets.iterator();

while (itr.hasNext()) {
Portlet portlet = itr.next();

List<String> modelNames =
ResourceActionsUtil.getPortletModelResources(
portlet.getPortletId());

for (long companyId : companyIds) {
ResourceCodeLocalServiceUtil.checkResourceCodes(
companyId, portlet.getPortletId());

for (String modelName : modelNames) {
ResourceCodeLocalServiceUtil.checkResourceCodes(
companyId, modelName);
}
}
}
}

我们逐行分析：

02行：

02行会发起一个数据库的查询，来获取Liferay实例对应的数据库中存放的所有company的id,这个方法在PortalInstances类中：

private long[] _getCompanyIdsBySQL() throws SQLException {
List<Long> companyIds = new ArrayList<Long>();

...
try {
con = DataAccess.getConnection();

ps = con.prepareStatement(_GET_COMPANY_IDS);

rs = ps.executeQuery();

while (rs.next()) {
long companyId = rs.getLong("companyId");

companyIds.add(companyId);
}
}
finally {
DataAccess.cleanUp(con, ps, rs);
}

return ArrayUtil.toArray(
companyIds.toArray(new Long[companyIds.size()]));
}

04-06行会迭代所有的portlet,对于每一个portlet:

09-11行：

09-11行会根据这个portlet的id来获取这个portlet的model的名字列表,它会调用ResourceActionUtil类的getPortletModelResources方法：

public static List<String> getPortletModelResources(String portletName) {
return getResourceActions().getPortletModelResources(portletName);
}

进而最终调用ResourceActionsImpl的getPortletModelResources方法：

public List<String> getPortletModelResources(String portletName) {
portletName = PortletConstants.getRootPortletId(portletName);

Set<String> resources = _portletModelResources.get(portletName);

if (resources == null) {
return new UniqueList<String>();
}
else {
return Collections.list(Collections.enumeration(resources));
}
}

从这里我们可以看出，它是从_portletModelResources中获取与portletName对应的Model名字列表，怎么获得呢，见readModelResource方法：

protected void readModelResource(
String servletContextName, Element modelResourceElement) {

String name = modelResourceElement.elementTextTrim("model-name");

Element portletRefElement = modelResourceElement.element("portlet-ref");

for (Element portletNameElement :
portletRefElement.elements("portlet-name")) {

String portletName = portletNameElement.getTextTrim();

if (servletContextName != null) {
portletName =
portletName.concat(PortletConstants.WAR_SEPARATOR).concat(
servletContextName);
}

portletName = portal.getJsSafePortletId(portletName);

// Reference for a portlet to child models

Set<String> modelResources = _portletModelResources.get(
portletName);

if (modelResources == null) {
modelResources = new HashSet<String>();

_portletModelResources.put(portletName, modelResources);
}

modelResources.add(name);

// Reference for a model to parent portlets

Set<String> portletResources = _modelPortletResources.get(name);

if (portletResources == null) {
portletResources = new HashSet<String>();

_modelPortletResources.put(name, portletResources);
}

portletResources.add(portletName);
}

List<String> supportsActions = readSupportsActions(
modelResourceElement, _modelResourceActions, name);

checkModelActions(supportsActions);

setActions(_modelResourceActions, name, supportsActions);

readGroupDefaultActions(
modelResourceElement, _modelResourceGroupDefaultActions, name);

List<String> guestDefaultActions = readGuestDefaultActions(
modelResourceElement, _modelResourceGuestDefaultActions, name);

readGuestUnsupportedActions(
modelResourceElement, _modelResourceGuestUnsupportedActions, name,
guestDefaultActions);

setActions(
_modelResourceGuestDefaultActions, name, guestDefaultActions);

readOwnerDefaultActions(
modelResourceElement, _modelResourceOwnerDefaultActions, name);
}

分析第13-15行：

它会遍历每一个companyId,然后调用ResourceCodeLocalServiceUtil的checkResourceCodes方法来检查Resouce codes：

public static void checkResourceCodes(long companyId, java.lang.String name)
throws com.liferay.portal.kernel.exception.SystemException {
getService().checkResourceCodes(companyId, name);
}

它最终会委托ResouceCodeLocalServiceImpl的checkResourceCodes方法：

@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public void checkResourceCodes(long companyId, String name)
throws SystemException {

if (PropsValues.PERMISSIONS_USER_CHECK_ALGORITHM == 6) {
return;
}

getResourceCode(companyId, name, ResourceConstants.SCOPE_COMPANY);
getResourceCode(companyId, name, ResourceConstants.SCOPE_GROUP);
getResourceCode(
companyId, name, ResourceConstants.SCOPE_GROUP_TEMPLATE);
getResourceCode(companyId, name, ResourceConstants.SCOPE_INDIVIDUAL);
}

它先依然检查user check permission,然后对各个scope (company,group等），分别发起数据库查询(封装在如下的fetchByC_N_S方法中)来获取响应的ResourceCode:

public ResourceCode getResourceCode(long companyId, String name, int scope)
throws SystemException {

// Always cache the resource code. This table exists to improve
// performance. Create the resource code if one does not exist.

if (Validator.isNull(name)) {
name = StringPool.BLANK;
}

String key = encodeKey(companyId, name, scope);

ResourceCode resourceCode = _resourceCodes.get(key);

if (resourceCode == null) {
resourceCode = resourceCodePersistence.fetchByC_N_S(
companyId, name, scope);

if (resourceCode == null) {
resourceCode = resourceCodeLocalService.addResourceCode(
companyId, name, scope);
}

_resourceCodes.put(key, resourceCode);
}

return resourceCode;
}

17-19行，最终也是执行数据库查询，这里不再展开。