X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-dom-api%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fmd%2Fsal%2Fdom%2Fapi%2FDOMDataReadTransaction.java;h=111a503890f9e14fe8d3c8a1d70c3d739f5621d0;hb=751776589ce049c9c1c611d06335599b92087ee6;hp=9b70f0c4d708d63b1544d05dd1948df35e209912;hpb=a1ea6554ff025f333b171637b37a9ad87c7846ea;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 9b70f0c4d7..111a503890 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
@@ -7,17 +7,17 @@
  */
 package org.opendaylight.controller.md.sal.dom.api;
 
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.CheckedFuture;
 import org.opendaylight.controller.md.sal.common.api.data.AsyncReadTransaction;
 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;
 
-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}.
  */
@@ -25,7 +25,8 @@ public interface DOMDataReadTransaction extends AsyncReadTransaction<YangInstanc
 
     /**
      * Reads data from provided logical data store located at the provided path.
-     *<p>
+     *
+     * <p>
      * If the target is a subtree, then the whole subtree is read (and will be
      * accessible from the returned data object).
      *
@@ -49,8 +50,17 @@ public interface DOMDataReadTransaction extends AsyncReadTransaction<YangInstanc
             LogicalDatastoreType store, YangInstanceIdentifier path);
 
     /**
-     * Checks if data is available in the logical data store located at provided 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
@@ -62,7 +72,5 @@ public interface DOMDataReadTransaction extends AsyncReadTransaction<YangInstanc
      *         {@link ReadFailedException} or an exception derived from ReadFailedException.</li>
      *         </ul>
      */
-    CheckedFuture<Boolean, ReadFailedException> exists(
-        LogicalDatastoreType store, YangInstanceIdentifier path);
-
+    CheckedFuture<Boolean, ReadFailedException> exists(LogicalDatastoreType store, YangInstanceIdentifier path);
 }