X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;ds=sidebyside;f=opendaylight%2Fmd-sal%2Fsal-dom-api%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fmd%2Fsal%2Fdom%2Fapi%2FDOMDataReadTransaction.java;h=05ca61a3535699273ed4ca0e169a9fcbd9dc88b7;hb=206d37a9d8ac56b38e754da6ed3d09a60f1fea56;hp=5baa5e72d31e8fe0bbd8444c9d86444ca79e594c;hpb=4f8166639477de8c1c9048baee2ba70003748756;p=controller.git

diff --git a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMDataReadTransaction.java b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMDataReadTransaction.java
index 5baa5e72d3..05ca61a353 100644
--- a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMDataReadTransaction.java
+++ b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMDataReadTransaction.java
@@ -8,9 +8,70 @@
 package org.opendaylight.controller.md.sal.dom.api;
 
 import org.opendaylight.controller.md.sal.common.api.data.AsyncReadTransaction;
-import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 
-public interface DOMDataReadTransaction extends AsyncReadTransaction<InstanceIdentifier, NormalizedNode<?, ?>> {
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.CheckedFuture;
+
+/**
+ * A transaction that provides read access to a logical data store.
+ * <p>
+ * For more information on usage and examples, please see the documentation in {@link AsyncReadTransaction}.
+ */
+public interface DOMDataReadTransaction extends AsyncReadTransaction<YangInstanceIdentifier, NormalizedNode<?, ?>> {
+
+    /**
+     * Reads data from provided logical data store located at the provided path.
+     *<p>
+     * If the target is a subtree, then the whole subtree is read (and will be
+     * accessible from the returned data object).
+     *
+     * @param store
+     *            Logical data store from which read should occur.
+     * @param path
+     *            Path which uniquely identifies subtree which client want to
+     *            read
+     * @return a CheckFuture containing the result of the read. The Future blocks until the
+     *         commit operation is complete. Once complete:
+     *         <ul>
+     *         <li>If the data at the supplied path exists, the Future returns an Optional object
+     *         containing the data.</li>
+     *         <li>If the data at the supplied path does not exist, the Future returns
+     *         Optional#absent().</li>
+     *         <li>If the read of the data fails, the Future will fail with a
+     *         {@link ReadFailedException} or an exception derived from ReadFailedException.</li>
+     *         </ul>
+     */
+    CheckedFuture<Optional<NormalizedNode<?,?>>, ReadFailedException> read(
+            LogicalDatastoreType store, YangInstanceIdentifier path);
+
+    /**
+     /**
+     * Checks if data is available in the logical data store located at provided path.
+     * <p>
+     *
+     * Note: a successful result from this method makes no guarantee that a subsequent call to {@link #read}
+     * will succeed. It is possible that the data resides in a data store on a remote node and, if that
+     * node goes down or a network failure occurs, a subsequent read would fail. Another scenario is if
+     * the data is deleted in between the calls to <code>exists</code> and <code>read</code>
+     *
+     * @param store
+     *            Logical data store from which read should occur.
+     * @param path
+     *            Path which uniquely identifies subtree which client want to
+     *            check existence of
+     * @return a CheckFuture containing the result of the check.
+     *         <ul>
+     *         <li>If the data at the supplied path exists, the Future returns a Boolean
+     *         whose value is true, false otherwise</li>
+     *         <li>If checking for the data fails, the Future will fail with a
+     *         {@link ReadFailedException} or an exception derived from ReadFailedException.</li>
+     *         </ul>
+     */
+    CheckedFuture<Boolean, ReadFailedException> exists(
+        LogicalDatastoreType store, YangInstanceIdentifier path);
 
 }