X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=sxp-integration%2Fsxp-ep-provider%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fgroupbasedpolicy%2Fsxp%2Fep%2Fprovider%2Fimpl%2FSimpleCachedDao.java;fp=sxp-integration%2Fsxp-ep-provider%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fgroupbasedpolicy%2Fsxp%2Fep%2Fprovider%2Fimpl%2FSimpleCachedDao.java;h=913274bd367d3b0ca79c4a1875f02514fc68517d;hb=eace708ec9dd394c5eb7b74c46d1176d82e775e7;hp=0000000000000000000000000000000000000000;hpb=660f6fb82d48f2c43b92cd273593d49e3644bb41;p=groupbasedpolicy.git

diff --git a/sxp-integration/sxp-ep-provider/src/main/java/org/opendaylight/groupbasedpolicy/sxp/ep/provider/impl/SimpleCachedDao.java b/sxp-integration/sxp-ep-provider/src/main/java/org/opendaylight/groupbasedpolicy/sxp/ep/provider/impl/SimpleCachedDao.java
new file mode 100644
index 000000000..913274bd3
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+++ b/sxp-integration/sxp-ep-provider/src/main/java/org/opendaylight/groupbasedpolicy/sxp/ep/provider/impl/SimpleCachedDao.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016 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.groupbasedpolicy.sxp.ep.provider.impl;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Purpose: encapsulate access to DS by exposing
+ * <dl>
+ * <dt>find</dt>
+ * <dd>search through cached values</dd>
+ * <dt>update</dt>
+ * <dd>stores given pair (key, value) to local cache</dd>
+ * </dl>
+ *
+ * @param <K> data key type
+ * @param <V> data type
+ */
+public interface SimpleCachedDao<K, V> extends SimpleDao<K, V> {
+
+    /**
+     * store given pair to local cache
+     *
+     * @param key   associated to value
+     * @param value associated to key
+     */
+    V update(@Nonnull K key, @Nullable V value);
+
+    /**
+     * invalidate all cache entries
+     */
+    void invalidateCache();
+
+    /**
+     * @return true if there is nothing cached
+     */
+    boolean isEmpty();
+
+    /**
+     * @return unmodifiable iterator through all cached values
+     */
+    Iterable<V> values();
+}