Adding Intent Impl and shell command to install simple intent
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
new file mode 100644
index 0000000..f1c9de3
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
@@ -0,0 +1,363 @@
+package org.onlab.onos.net.intent.impl;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.onos.net.intent.IntentState.FAILED;
+import static org.onlab.onos.net.intent.IntentState.INSTALLED;
+import static org.onlab.onos.net.intent.IntentState.WITHDRAWING;
+import static org.onlab.onos.net.intent.IntentState.WITHDRAWN;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.onos.event.AbstractListenerRegistry;
+import org.onlab.onos.event.EventDeliveryService;
+import org.onlab.onos.net.intent.InstallableIntent;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentCompiler;
+import org.onlab.onos.net.intent.IntentEvent;
+import org.onlab.onos.net.intent.IntentException;
+import org.onlab.onos.net.intent.IntentExtensionService;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.IntentInstaller;
+import org.onlab.onos.net.intent.IntentListener;
+import org.onlab.onos.net.intent.IntentOperations;
+import org.onlab.onos.net.intent.IntentService;
+import org.onlab.onos.net.intent.IntentState;
+import org.onlab.onos.net.intent.IntentStore;
+import org.onlab.onos.net.intent.IntentStoreDelegate;
+import org.slf4j.Logger;
+
+import com.google.common.collect.ImmutableMap;
+
+/**
+ * An implementation of Intent Manager.
+ */
+@Component(immediate = true)
+@Service
+public class IntentManager
+ implements IntentService, IntentExtensionService {
+ private final Logger log = getLogger(getClass());
+
+ public static final String INTENT_NULL = "Intent cannot be null";
+ public static final String INTENT_ID_NULL = "Intent ID cannot be null";
+
+ // Collections for compiler, installer, and listener are ONOS instance local
+ private final ConcurrentMap<Class<? extends Intent>,
+ IntentCompiler<? extends Intent>> compilers = new ConcurrentHashMap<>();
+ private final ConcurrentMap<Class<? extends InstallableIntent>,
+ IntentInstaller<? extends InstallableIntent>> installers = new ConcurrentHashMap<>();
+ private final CopyOnWriteArrayList<IntentListener> listeners = new CopyOnWriteArrayList<>();
+
+ private final AbstractListenerRegistry<IntentEvent, IntentListener>
+ listenerRegistry = new AbstractListenerRegistry<>();
+
+ private final IntentStoreDelegate delegate = new InternalStoreDelegate();
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected IntentStore store;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected EventDeliveryService eventDispatcher;
+
+ @Activate
+ public void activate() {
+ store.setDelegate(delegate);
+ eventDispatcher.addSink(IntentEvent.class, listenerRegistry);
+
+// this.intentEvents = new IntentMap<>("intentState", IntentEvent.class, collectionsService);
+// this.installableIntents =
+// new IntentMap<>("installableIntents", IntentCompilationResult.class, collectionsService);
+//
+//
+// this.intentEvents.addListener(new InternalEntryListener(new InternalIntentEventListener()));
+
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ store.unsetDelegate(delegate);
+ eventDispatcher.removeSink(IntentEvent.class);
+ log.info("Stopped");
+ }
+
+ @Override
+ public void submit(Intent intent) {
+ checkNotNull(intent, INTENT_NULL);
+ registerSubclassCompilerIfNeeded(intent);
+ IntentEvent event = store.createIntent(intent);
+ eventDispatcher.post(event);
+ processStoreEvent(event);
+ }
+
+ @Override
+ public void withdraw(Intent intent) {
+ checkNotNull(intent, INTENT_NULL);
+ IntentEvent event = store.setState(intent, WITHDRAWING);
+ eventDispatcher.post(event);
+ processStoreEvent(event);
+ }
+
+ // FIXME: implement this method
+ @Override
+ public void execute(IntentOperations operations) {
+ throw new UnsupportedOperationException("execute() is not implemented yet");
+ }
+
+ @Override
+ public Iterable<Intent> getIntents() {
+ return store.getIntents();
+ }
+
+ @Override
+ public long getIntentCount() {
+ return store.getIntentCount();
+ }
+
+ @Override
+ public Intent getIntent(IntentId id) {
+ checkNotNull(id, INTENT_ID_NULL);
+ return store.getIntent(id);
+ }
+
+ @Override
+ public IntentState getIntentState(IntentId id) {
+ checkNotNull(id, INTENT_ID_NULL);
+ return store.getIntentState(id);
+ }
+
+ @Override
+ public void addListener(IntentListener listener) {
+ listenerRegistry.addListener(listener);
+ }
+
+ @Override
+ public void removeListener(IntentListener listener) {
+ listenerRegistry.removeListener(listener);
+ }
+
+ @Override
+ public <T extends Intent> void registerCompiler(Class<T> cls, IntentCompiler<T> compiler) {
+ compilers.put(cls, compiler);
+ }
+
+ @Override
+ public <T extends Intent> void unregisterCompiler(Class<T> cls) {
+ compilers.remove(cls);
+ }
+
+ @Override
+ public Map<Class<? extends Intent>, IntentCompiler<? extends Intent>> getCompilers() {
+ return ImmutableMap.copyOf(compilers);
+ }
+
+ @Override
+ public <T extends InstallableIntent> void registerInstaller(Class<T> cls, IntentInstaller<T> installer) {
+ installers.put(cls, installer);
+ }
+
+ @Override
+ public <T extends InstallableIntent> void unregisterInstaller(Class<T> cls) {
+ installers.remove(cls);
+ }
+
+ @Override
+ public Map<Class<? extends InstallableIntent>, IntentInstaller<? extends InstallableIntent>> getInstallers() {
+ return ImmutableMap.copyOf(installers);
+ }
+
+ /**
+ * Invokes all of registered intent event listener.
+ *
+ * @param event event supplied to a listener as an argument
+ */
+ private void invokeListeners(IntentEvent event) {
+ for (IntentListener listener : listeners) {
+ listener.event(event);
+ }
+ }
+
+ /**
+ * Returns the corresponding intent compiler to the specified intent.
+ *
+ * @param intent intent
+ * @param <T> the type of intent
+ * @return intent compiler corresponding to the specified intent
+ */
+ private <T extends Intent> IntentCompiler<T> getCompiler(T intent) {
+ @SuppressWarnings("unchecked")
+ IntentCompiler<T> compiler = (IntentCompiler<T>) compilers.get(intent.getClass());
+ if (compiler == null) {
+ throw new IntentException("no compiler for class " + intent.getClass());
+ }
+ return compiler;
+ }
+
+ /**
+ * Returns the corresponding intent installer to the specified installable intent.
+ * @param intent intent
+ * @param <T> the type of installable intent
+ * @return intent installer corresponding to the specified installable intent
+ */
+ private <T extends InstallableIntent> IntentInstaller<T> getInstaller(T intent) {
+ @SuppressWarnings("unchecked")
+ IntentInstaller<T> installer = (IntentInstaller<T>) installers.get(intent.getClass());
+ if (installer == null) {
+ throw new IntentException("no installer for class " + intent.getClass());
+ }
+ return installer;
+ }
+
+ /**
+ * Compiles an intent.
+ *
+ * @param intent intent
+ */
+ private void compileIntent(Intent intent) {
+ // FIXME: To make SDN-IP workable ASAP, only single level compilation is implemented
+ // TODO: implement compilation traversing tree structure
+ List<InstallableIntent> installable = new ArrayList<>();
+ for (Intent compiled : getCompiler(intent).compile(intent)) {
+ installable.add((InstallableIntent) compiled);
+ }
+ IntentEvent event = store.addInstallableIntents(intent.getId(), installable);
+ eventDispatcher.post(event);
+ processStoreEvent(event);
+ }
+
+ /**
+ * Installs an intent.
+ *
+ * @param intent intent
+ */
+ private void installIntent(Intent intent) {
+ for (InstallableIntent installable : store.getInstallableIntents(intent.getId())) {
+ registerSubclassInstallerIfNeeded(installable);
+ getInstaller(installable).install(installable);
+ }
+
+ IntentEvent event = store.setState(intent, INSTALLED);
+ eventDispatcher.post(event);
+ processStoreEvent(event);
+
+ }
+
+ /**
+ * Uninstalls an intent.
+ *
+ * @param intent intent
+ */
+ private void uninstallIntent(Intent intent) {
+ for (InstallableIntent installable : store.getInstallableIntents(intent.getId())) {
+ getInstaller(installable).uninstall(installable);
+ }
+
+ store.removeInstalledIntents(intent.getId());
+ store.setState(intent, WITHDRAWN);
+ }
+
+ /**
+ * Registers an intent compiler of the specified intent if an intent compiler
+ * for the intent is not registered. This method traverses the class hierarchy of
+ * the intent. Once an intent compiler for a parent type is found, this method
+ * registers the found intent compiler.
+ *
+ * @param intent intent
+ */
+ private void registerSubclassCompilerIfNeeded(Intent intent) {
+ if (!compilers.containsKey(intent.getClass())) {
+ Class<?> cls = intent.getClass();
+ while (cls != Object.class) {
+ // As long as we're within the Intent class descendants
+ if (Intent.class.isAssignableFrom(cls)) {
+ IntentCompiler<?> compiler = compilers.get(cls);
+ if (compiler != null) {
+ compilers.put(intent.getClass(), compiler);
+ return;
+ }
+ }
+ cls = cls.getSuperclass();
+ }
+ }
+ }
+
+ /**
+ * Registers an intent installer of the specified intent if an intent installer
+ * for the intent is not registered. This method traverses the class hierarchy of
+ * the intent. Once an intent installer for a parent type is found, this method
+ * registers the found intent installer.
+ *
+ * @param intent intent
+ */
+ private void registerSubclassInstallerIfNeeded(InstallableIntent intent) {
+ if (!installers.containsKey(intent.getClass())) {
+ Class<?> cls = intent.getClass();
+ while (cls != Object.class) {
+ // As long as we're within the InstallableIntent class descendants
+ if (InstallableIntent.class.isAssignableFrom(cls)) {
+ IntentInstaller<?> installer = installers.get(cls);
+ if (installer != null) {
+ installers.put(intent.getClass(), installer);
+ return;
+ }
+ }
+ cls = cls.getSuperclass();
+ }
+ }
+ }
+
+ /**
+ * Handles state transition of submitted intents.
+ */
+ private void processStoreEvent(IntentEvent event) {
+ invokeListeners(event);
+ Intent intent = event.getIntent();
+
+ try {
+ switch (event.getState()) {
+ case SUBMITTED:
+ compileIntent(intent);
+ break;
+ case COMPILED:
+ installIntent(intent);
+ break;
+ case INSTALLED:
+ break;
+ case WITHDRAWING:
+ uninstallIntent(intent);
+ break;
+ case WITHDRAWN:
+ break;
+ case FAILED:
+ break;
+ default:
+ throw new IllegalStateException(
+ "the state of IntentEvent is illegal: " + event.getState());
+ }
+ } catch (IntentException e) {
+ store.setState(intent, FAILED);
+ }
+
+ }
+
+ // Store delegate to re-post events emitted from the store.
+ private class InternalStoreDelegate implements IntentStoreDelegate {
+ @Override
+ public void notify(IntentEvent event) {
+ processStoreEvent(event);
+ eventDispatcher.post(event);
+ }
+ }
+
+}