--- /dev/null
+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.md.sal.dom.api;
+
+import java.util.Collection;
+import java.util.EventListener;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
+
+/**
+ * Interface implemented by classes interested in receiving notifications about
+ * data tree changes. This interface differs from {@link DOMDataChangeListener}
+ * in that it provides a cursor-based view of the change, which has potentially
+ * lower overhead.
+ */
+public interface DOMDataTreeChangeListener extends EventListener {
+ /**
+ * Invoked when there was data change for the supplied path, which was used
+ * to register this listener.
+ *
+ * <p>
+ * This method may be also invoked during registration of the listener if
+ * there is any pre-existing data in the conceptual data tree for supplied
+ * path. This initial event will contain all pre-existing data as created.
+ *
+ * <p>
+ * A data change event may be triggered spuriously, e.g. such that data before
+ * and after compare as equal. Implementations of this interface are expected
+ * to recover from such events. Event producers are expected to exert reasonable
+ * effort to suppress such events.
+ *
+ * In other words, it is completely acceptable to observe
+ * a {@link org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode},
+ * which reports a {@link org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType}
+ * other than UNMODIFIED, while the before- and after- data items compare as
+ * equal.
+ *
+ * @param changes Collection of change events, may not be null or empty.
+ */
+ void onDataTreeChanged(@Nonnull Collection<DataTreeCandidate> changes);
+}
--- /dev/null
+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.md.sal.dom.api;
+
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+
+/**
+ * A {@link DOMService} which allows users to register for changes to a
+ * subtree.
+ */
+public interface DOMDataTreeChangeService extends DOMService {
+ /**
+ * Registers a {@link DOMDataTreeChangeListener} to receive
+ * notifications when data changes under a given path in the conceptual data
+ * tree.
+ * <p>
+ * You are able to register for notifications for any node or subtree
+ * which can be represented using {@link DOMDataTreeIdentifier}.
+ * <p>
+ *
+ * You are able to register for data change notifications for a subtree or leaf
+ * even if it does not exist. You will receive notification once that node is
+ * created.
+ * <p>
+ * If there is any pre-existing data in the data tree for the path for which you are
+ * registering, you will receive an initial data change event, which will
+ * contain all pre-existing data, marked as created.
+ *
+ * <p>
+ * This method returns a {@link ListenerRegistration} object. To
+ * "unregister" your listener for changes call the {@link ListenerRegistration#close()}
+ * method on the returned object.
+ * <p>
+ * You MUST explicitly unregister your listener when you no longer want to receive
+ * notifications. This is especially true in OSGi environments, where failure to
+ * do so during bundle shutdown can lead to stale listeners being still registered.
+ *
+ * @param treeId
+ * Data tree identifier of the subtree which should be watched for
+ * changes.
+ * @param listener
+ * Listener instance which is being registered
+ * @return Listener registration object, which may be used to unregister
+ * your listener using {@link ListenerRegistration#close()} to stop
+ * delivery of change events.
+ */
+ @Nonnull <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerDataTreeChangeListener(@Nonnull DOMDataTreeIdentifier treeId, @Nonnull L listener);
+}
--- /dev/null
+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.md.sal.dom.api;
+
+import com.google.common.base.Preconditions;
+import java.io.Serializable;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.yangtools.concepts.Immutable;
+import org.opendaylight.yangtools.concepts.Path;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+
+/**
+ * A unique identifier for a particular subtree. It is composed of the logical
+ * data store type and the instance identifier of the root node.
+ */
+public final class DOMDataTreeIdentifier implements Immutable, Path<DOMDataTreeIdentifier>, Serializable {
+ private static final long serialVersionUID = 1L;
+ private final YangInstanceIdentifier rootIdentifier;
+ private final LogicalDatastoreType datastoreType;
+
+ public DOMDataTreeIdentifier(final LogicalDatastoreType datastoreType, final YangInstanceIdentifier rootIdentifier) {
+ this.datastoreType = Preconditions.checkNotNull(datastoreType);
+ this.rootIdentifier = Preconditions.checkNotNull(rootIdentifier);
+ }
+
+ /**
+ * Return the logical data store type.
+ *
+ * @return Logical data store type. Guaranteed to be non-null.
+ */
+ public @Nonnull LogicalDatastoreType getDatastoreType() {
+ return datastoreType;
+ }
+
+ /**
+ * Return the {@link YangInstanceIdentifier} of the root node.
+ *
+ * @return Instance identifier corresponding to the root node.
+ */
+ public @Nonnull YangInstanceIdentifier getRootIdentifier() {
+ return rootIdentifier;
+ }
+
+ @Override
+ public boolean contains(final DOMDataTreeIdentifier other) {
+ return datastoreType == other.datastoreType && rootIdentifier.contains(other.rootIdentifier);
+ }
+
+ @Override
+ public int hashCode() {
+ final int prime = 31;
+ int result = 1;
+ result = prime * result + datastoreType.hashCode();
+ result = prime * result + rootIdentifier.hashCode();
+ return result;
+ }
+
+ @Override
+ public boolean equals(final Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (!(obj instanceof DOMDataTreeIdentifier)) {
+ return false;
+ }
+ DOMDataTreeIdentifier other = (DOMDataTreeIdentifier) obj;
+ if (datastoreType != other.datastoreType) {
+ return false;
+ }
+ return rootIdentifier.equals(other.rootIdentifier);
+ }
+}
--- /dev/null
+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.sal.core.spi.data;
+
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+
+/**
+ * Interface implemented by DOMStore implementations which allow registration
+ * of {@link DOMDataTreeChangeListener} instances.
+ */
+public interface DOMStoreTreeChangePublisher {
+ /**
+ * Registers a {@link DOMDataTreeChangeListener} to receive
+ * notifications when data changes under a given path in the conceptual data
+ * tree.
+ * <p>
+ * You are able to register for notifications for any node or subtree
+ * which can be represented using {@link YangInstanceIdentifier}.
+ * <p>
+ *
+ * You are able to register for data change notifications for a subtree or leaf
+ * even if it does not exist. You will receive notification once that node is
+ * created.
+ * <p>
+ * If there is any pre-existing data in data tree on path for which you are
+ * registering, you will receive initial data change event, which will
+ * contain all pre-existing data, marked as created.
+ *
+ * <p>
+ * This method returns a {@link ListenerRegistration} object. To
+ * "unregister" your listener for changes call the {@link ListenerRegistration#close()}
+ * method on this returned object.
+ * <p>
+ * You MUST explicitly unregister your listener when you no longer want to receive
+ * notifications. This is especially true in OSGi environments, where failure to
+ * do so during bundle shutdown can lead to stale listeners being still registered.
+ *
+ * @param treeId
+ * Data tree identifier of the subtree which should be watched for
+ * changes.
+ * @param listener
+ * Listener instance which is being registered
+ * @return Listener registration object, which may be used to unregister
+ * your listener using {@link ListenerRegistration#close()} to stop
+ * delivery of change events.
+ */
+ @Nonnull <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerTreeChangeListener(@Nonnull YangInstanceIdentifier treeId, @Nonnull L listener);
+}
Code Review / controller.git / commitdiff