mirror of
https://github.com/apache/cloudstack.git
synced 2025-10-26 08:42:29 +01:00
Added support for component libraries in plugins
This commit is contained in:
Alex Huang
parent
75184d33ea
commit
1d3a443237
@ -71,15 +71,48 @@ import com.cloud.utils.mgmt.JmxUtil;
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import com.cloud.utils.mgmt.ManagementBean;
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/**
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* ComponentLocator manages all of the adapters within a system. It operates on
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* top of an components.xml and uses reflection to instantiate all of the
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* adapters. It also supports rereading of all of the adapters.
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* ComponentLocator ties together several different concepts. First, it
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* deals with how a system should be put together. It manages different
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* types of components:
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* - Manager: Singleton implementation of a certain process.
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* - Adapter: Different singleton implementations for the same functions.
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* - SystemIntegrityChecker: Singletons that are called at the load time.
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* - Dao: Data Access Objects.
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*
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* These components can be declared in several ways:
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* - ComponentLibrary - A Java class that declares the above components. The
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* advantage of declaring components here is they change automatically
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* with any refactoring.
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* - components specification - An xml file that overrides the
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* ComponentLibrary. The advantage of declaring components here is
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* they can change by hand on every deployment.
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*
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* The two are NOT mutually exclusive. ComponentLocator basically locates
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* the components specification, which specifies the ComponentLibrary within.
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* Components found in the ComponentLibrary are overridden by components
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* found in components specification.
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*
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* Components specification can also be nested. One components specification
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* can point to another components specification and, therefore, "inherits"
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* those components but still override one or more components. ComponentLocator
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* reads the child components specification first and follow the chain up.
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* the child's components overrides the ones in the parent.
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*
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* ComponentLocator looks for the components specification as follows:
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* 1. By following the path specified by "cloud-stack-components-specification"
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* within the environment.properties file.
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* 2. Look for components.xml in the class path.
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*
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* ComponentLocator also ties in component injection. Components can specify
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* an @Inject annotation to components ComponentLocator knows. When
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* instantiating components, ComponentLocator attempts to inject these
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* components.
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*
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**/
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@SuppressWarnings("unchecked")
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public class ComponentLocator implements ComponentLocatorMBean {
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protected static final Logger s_logger = Logger.getLogger(ComponentLocator.class);
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protected static final ThreadLocal<ComponentLocator> s_tl = new ThreadLocal<ComponentLocator>();
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protected static final ConcurrentHashMap<Class<?>, Singleton> s_singletons = new ConcurrentHashMap<Class<?>, Singleton>(111);
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protected static final HashMap<String, ComponentLocator> s_locators = new HashMap<String, ComponentLocator>();
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@ -90,7 +123,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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protected static CallbackFilter s_callbackFilter = new DatabaseCallbackFilter();
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protected static final List<AnnotationInterceptor<?>> s_interceptors = new ArrayList<AnnotationInterceptor<?>>();
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protected static CleanupThread s_janitor = null;
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protected HashMap<String, Adapters<? extends Adapter>> _adapterMap;
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protected HashMap<String, ComponentInfo<Manager>> _managerMap;
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protected LinkedHashMap<String, ComponentInfo<SystemIntegrityChecker>> _checkerMap;
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@ -98,8 +131,8 @@ public class ComponentLocator implements ComponentLocatorMBean {
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protected String _serverName;
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protected Object _component;
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protected HashMap<Class<?>, Class<?>> _factories;
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protected HashMap<String, ComponentInfo<PluggableService>> _pluggableServicesMap;
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protected HashMap<String, ComponentInfo<PluggableService>> _pluginsMap;
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static {
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if (s_janitor == null) {
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s_janitor = new CleanupThread();
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@ -118,7 +151,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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public String getLocatorName() {
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return _serverName;
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}
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@Override
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public String getName() {
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return getLocatorName();
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@ -133,7 +166,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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_checkerMap = new LinkedHashMap<String, ComponentInfo<SystemIntegrityChecker>>();
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_adapterMap = new HashMap<String, Adapters<? extends Adapter>>();
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_factories = new HashMap<Class<?>, Class<?>>();
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_pluggableServicesMap = new LinkedHashMap<String, ComponentInfo<PluggableService>>();
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_pluginsMap = new LinkedHashMap<String, ComponentInfo<PluggableService>>();
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File file = PropertiesUtil.findConfigFile(filename);
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if (file == null) {
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s_logger.info("Unable to find " + filename);
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@ -157,7 +190,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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_daoMap.putAll(parentLocator._daoMap);
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_managerMap.putAll(parentLocator._managerMap);
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_factories.putAll(parentLocator._factories);
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_pluggableServicesMap.putAll(parentLocator._pluggableServicesMap);
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_pluginsMap.putAll(parentLocator._pluginsMap);
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}
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ComponentLibrary library = null;
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@ -168,15 +201,15 @@ public class ComponentLocator implements ComponentLocatorMBean {
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_managerMap.putAll(library.getManagers());
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adapters.putAll(library.getAdapters());
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_factories.putAll(library.getFactories());
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_pluggableServicesMap.putAll(library.getPluggableServices());
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_pluginsMap.putAll(library.getPluggableServices());
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}
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_daoMap.putAll(handler.daos);
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_managerMap.putAll(handler.managers);
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_checkerMap.putAll(handler.checkers);
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adapters.putAll(handler.adapters);
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_pluggableServicesMap.putAll(handler.pluggableServices);
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_pluginsMap.putAll(handler.pluggableServices);
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return new Pair<XmlHandler, HashMap<String, List<ComponentInfo<Adapter>>>>(handler, adapters);
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} catch (ParserConfigurationException e) {
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s_logger.error("Unable to load " + _serverName + " due to errors while parsing " + filename, e);
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@ -203,7 +236,9 @@ public class ComponentLocator implements ComponentLocatorMBean {
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s_logger.info("Skipping configuration using " + filename);
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return;
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}
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instantiatePluggableServices();
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XmlHandler handler = result.first();
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HashMap<String, List<ComponentInfo<Adapter>>> adapters = result.second();
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try {
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@ -220,13 +255,12 @@ public class ComponentLocator implements ComponentLocatorMBean {
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startAdapters();
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//TODO do we need to follow the instantiate -> inject -> configure -> start -> stop flow of singletons like managers/adapters?
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//TODO do we need to expose pluggableServices to MBean (provide getNames?)
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instantiatePluggableServices();
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} catch (CloudRuntimeException e) {
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s_logger.error("Unable to load configuration for " + _serverName + " from " + filename, e);
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System.exit(1);
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} catch (Exception e) {
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s_logger.error("Unable to load configuration for " + _serverName + " from " + filename, e);
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System.exit(1);
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s_logger.error("Unable to load configuration for " + _serverName + " from " + filename, e);
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System.exit(1);
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}
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}
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@ -288,7 +322,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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}
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}
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private static Object createInstance(Class<?> clazz, boolean inject, boolean singleton, Object... args) {
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Factory factory = null;
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Singleton entity = null;
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@ -313,8 +347,8 @@ public class ComponentLocator implements ComponentLocatorMBean {
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factory = info.factory;
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}
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}
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Class<?>[] argTypes = null;
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if (args != null && args.length > 0) {
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Constructor<?>[] constructors = clazz.getConstructors();
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@ -334,49 +368,49 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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}
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}
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if (argTypes == null) {
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throw new CloudRuntimeException("Unable to find constructor to match parameters given: " + clazz.getName());
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}
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entity = new Singleton(factory.newInstance(argTypes, args, s_callbacks));
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} else {
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entity = new Singleton(factory.newInstance(s_callbacks));
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}
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if (inject) {
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inject(clazz, entity.singleton);
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entity.state = Singleton.State.Injected;
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}
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if (singleton) {
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synchronized(s_factories) {
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s_singletons.put(clazz, entity);
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}
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}
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return entity.singleton;
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}
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protected ComponentInfo<GenericDao<?, ?>> getDao(String name) {
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ComponentInfo<GenericDao<?, ?>> info = _daoMap.get(name);
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if (info == null) {
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throw new CloudRuntimeException("Unable to find DAO " + name);
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}
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return info;
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}
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public static synchronized Object getComponent(String componentName) {
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synchronized(_hasCheckerRun) {
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/* System Integrity checker will run before all components really loaded */
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if (!_hasCheckerRun && !componentName.equalsIgnoreCase(SystemIntegrityChecker.Name)) {
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ComponentLocator.getComponent(SystemIntegrityChecker.Name);
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_hasCheckerRun = true;
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}
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}
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synchronized(_hasCheckerRun) {
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/* System Integrity checker will run before all components really loaded */
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if (!_hasCheckerRun && !componentName.equalsIgnoreCase(SystemIntegrityChecker.Name)) {
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ComponentLocator.getComponent(SystemIntegrityChecker.Name);
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_hasCheckerRun = true;
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}
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}
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ComponentLocator locator = s_locators.get(componentName);
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if (locator == null) {
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locator = ComponentLocator.getLocator(componentName);
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@ -441,10 +475,10 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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}
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}
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protected static void inject(Class<?> clazz, Object entity) {
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ComponentLocator locator = ComponentLocator.getCurrentLocator();
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do {
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Field[] fields = clazz.getDeclaredFields();
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for (Field field : fields) {
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@ -467,11 +501,11 @@ public class ComponentLocator implements ComponentLocatorMBean {
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s_logger.trace("Other:" + fc.getName());
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instance = locator.getManager(fc);
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}
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if (instance == null) {
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throw new CloudRuntimeException("Unable to inject " + fc.getSimpleName() + " in " + clazz.getSimpleName());
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}
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try {
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field.setAccessible(true);
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field.set(entity, instance);
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@ -545,7 +579,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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return (T)info.instance;
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}
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protected void configureAdapters() {
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for (Adapters<? extends Adapter> adapters : _adapterMap.values()) {
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List<ComponentInfo<Adapter>> infos = adapters._infos;
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@ -597,7 +631,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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_adapterMap.put(entry.getKey(), adapters);
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}
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}
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protected void instantiateAdapters(Map<String, List<ComponentInfo<Adapter>>> map) {
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Set<Map.Entry<String, List<ComponentInfo<Adapter>>>> entries = map.entrySet();
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for (Map.Entry<String, List<ComponentInfo<Adapter>>> entry : entries) {
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@ -641,18 +675,26 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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protected void instantiatePluggableServices() {
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Set<Map.Entry<String, ComponentInfo<PluggableService>>> entries = _pluggableServicesMap.entrySet();
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Set<Map.Entry<String, ComponentInfo<PluggableService>>> entries = _pluginsMap.entrySet();
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for (Map.Entry<String, ComponentInfo<PluggableService>> entry : entries) {
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ComponentInfo<PluggableService> info = entry.getValue();
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if (info.instance == null) {
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s_logger.info("Instantiating PluggableService: " + info.name);
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info.instance = (PluggableService)createInstance(info.clazz, false, info.singleton);
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if (info.instance instanceof Plugin) {
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Plugin plugin = (Plugin)info.instance;
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ComponentLibrary lib = plugin.getComponentLibrary();
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_managerMap.putAll(lib.getManagers());
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_daoMap.putAll(lib.getDaos());
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}
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}
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}
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}
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protected ComponentInfo<PluggableService> getPluggableService(String name) {
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ComponentInfo<PluggableService> mgr = _pluggableServicesMap.get(name);
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ComponentInfo<PluggableService> mgr = _pluginsMap.get(name);
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return mgr;
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}
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@ -669,7 +711,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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public <T> List<T> getAllPluggableServices() {
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List<T> services = new ArrayList<T>();
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Set<Map.Entry<String, ComponentInfo<PluggableService>>> entries = _pluggableServicesMap.entrySet();
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Set<Map.Entry<String, ComponentInfo<PluggableService>>> entries = _pluginsMap.entrySet();
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for (Map.Entry<String, ComponentInfo<PluggableService>> entry : entries) {
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ComponentInfo<PluggableService> info = entry.getValue();
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if (info.instance == null) {
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@ -680,11 +722,11 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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return services;
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}
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public static <T> T inject(Class<T> clazz) {
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return (T)createInstance(clazz, true, false);
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}
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public <T> T createInstance(Class<T> clazz) {
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Class<? extends T> impl = (Class<? extends T>)_factories.get(clazz);
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if (impl == null) {
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@ -692,11 +734,11 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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return inject(impl);
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}
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public static <T> T inject(Class<T> clazz, Object... args) {
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return (T)createInstance(clazz, true, false, args);
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}
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@Override
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public Map<String, List<String>> getAdapterNames() {
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HashMap<String, List<String>> result = new HashMap<String, List<String>>();
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@ -749,7 +791,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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return new Adapters<Adapter>(key, new ArrayList<ComponentInfo<Adapter>>());
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}
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protected void resetInterceptors(InterceptorLibrary library) {
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library.addInterceptors(s_interceptors);
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if (s_interceptors.size() > 0) {
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@ -781,7 +823,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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s_once = true;
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}
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}
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ComponentLocator locator;
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synchronized (s_locators) {
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locator = s_locators.get(server);
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@ -822,7 +864,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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} catch (IOException e) {
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s_logger.debug("environment.properties could not be loaded:" + e.toString());
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}
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if (configFile == null || PropertiesUtil.findConfigFile(configFile) == null) {
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configFile = "components.xml";
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if (PropertiesUtil.findConfigFile(configFile) == null){
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@ -843,31 +885,31 @@ public class ComponentLocator implements ComponentLocatorMBean {
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List<String> keys = new ArrayList<String>();
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T instance;
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boolean singleton = true;
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protected ComponentInfo() {
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}
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public List<String> getKeys() {
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return keys;
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}
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public String getName() {
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return name;
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}
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public ComponentInfo(String name, Class<? extends T> clazz) {
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this(name, clazz, new ArrayList<Pair<String, Object>>(0));
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}
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public ComponentInfo(String name, Class<? extends T> clazz, T instance) {
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this(name, clazz);
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this.instance = instance;
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}
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public ComponentInfo(String name, Class<? extends T> clazz, List<Pair<String, Object>> params) {
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this(name, clazz, params, true);
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}
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public ComponentInfo(String name, Class<? extends T> clazz, List<Pair<String, Object>> params, boolean singleton) {
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this.name = name;
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this.clazz = clazz;
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@ -877,10 +919,10 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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fillInfo();
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}
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protected void fillInfo() {
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String clazzName = clazz.getName();
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Local local = clazz.getAnnotation(Local.class);
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if (local == null) {
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throw new CloudRuntimeException("Unable to find Local annotation for class " + clazzName);
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@ -900,7 +942,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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}
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}
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}
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public void addParameter(String name, String value) {
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params.put(name, value);
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}
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@ -964,13 +1006,13 @@ public class ComponentLocator implements ComponentLocatorMBean {
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if (singleton != null) {
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info.singleton = Boolean.parseBoolean(singleton);
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}
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info.fillInfo();
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}
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@Override
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public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
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throws SAXException {
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throws SAXException {
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if (qName.equals("interceptor") && s_interceptors.size() == 0) {
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synchronized(s_interceptors){
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if (s_interceptors.size() == 0) {
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@ -1001,7 +1043,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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throw new CloudRuntimeException("Unable to find " + implementationClass, e);
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}
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}
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library = getAttribute(atts, "library");
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}
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} else if (qName.equals("adapters")) {
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@ -1041,7 +1083,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
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checkers.put(info.name, info);
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s_logger.info("Adding system integrity checker: " + info.name);
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currentInfo = info;
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} else if (qName.equals("pluggableservice")) {
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} else if (qName.equals("pluggableservice") || qName.equals("plugin")) {
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ComponentInfo<PluggableService> info = new ComponentInfo<PluggableService>();
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fillInfo(atts, PluggableService.class, info);
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s_logger.info("Adding PluggableService: " + info.name);
|
||||
@ -1096,17 +1138,17 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
protected static class InjectInfo {
|
||||
public Factory factory;
|
||||
public Enhancer enhancer;
|
||||
|
||||
|
||||
public InjectInfo(Enhancer enhancer, Factory factory) {
|
||||
this.factory = factory;
|
||||
this.enhancer = enhancer;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
protected static class CleanupThread extends Thread {
|
||||
@Override
|
||||
public void run() {
|
||||
@ -1133,7 +1175,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
for (ComponentLocator locator : s_locators.values()) {
|
||||
Iterator<ComponentInfo<Manager>> itManagers = locator._managerMap.values().iterator();
|
||||
while (itManagers.hasNext()) {
|
||||
@ -1154,7 +1196,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static class Singleton {
|
||||
public enum State {
|
||||
Instantiated,
|
||||
@ -1163,16 +1205,16 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
Started,
|
||||
Stopped
|
||||
}
|
||||
|
||||
|
||||
public Object singleton;
|
||||
public State state;
|
||||
|
||||
|
||||
public Singleton(Object singleton) {
|
||||
this.singleton = singleton;
|
||||
this.state = State.Instantiated;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
protected class InterceptorDispatcher implements MethodInterceptor {
|
||||
|
||||
@Override
|
||||
@ -1200,7 +1242,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
protected static class InterceptorFilter implements CallbackFilter {
|
||||
@Override
|
||||
public int accept(Method method) {
|
||||
@ -1215,7 +1257,7 @@ public class ComponentLocator implements ComponentLocatorMBean {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
return index;
|
||||
}
|
||||
}
|
||||
|
||||
@ -17,6 +17,7 @@
|
||||
package com.cloud.utils.component;
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* This interface defines methods for pluggable code within the Cloud Stack.
|
||||
*/
|
||||
@ -26,5 +27,5 @@ public interface PluggableService {
|
||||
* The config file name that lists API commands supported by this pluggable service
|
||||
*/
|
||||
String getPropertiesFile();
|
||||
|
||||
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user