Merge "Merge from ECOMP's repository"

1 files changed, 37 insertions, 0 deletions

diff --git a/vid-app-common/src/main/java/org/onap/vid/aai/util/CacheProvider.java b/vid-app-common/src/main/java/org/onap/vid/aai/util/CacheProvider.java
new file mode 100644
index 000000000..63615f492
--- /dev/null
+++ b/vid-app-common/src/main/java/org/onap/vid/aai/util/CacheProvider.java
@@ -0,0 +1,37 @@
+package org.onap.vid.aai.util;
+
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.apache.commons.lang3.ObjectUtils.defaultIfNull;
+
+public interface CacheProvider {
+    String KEY_DELIMITER = "!@#'";
+    /*
+    Returns the cache associated with given name; creates one if wasn't any
+    */
+    <K, V> Cache<K, V> aaiClientCacheFor(String name, Function<K, V> loader);
+
+    /*
+    reset cache if exist. Otherwise do nothing
+     */
+    void resetCache(String name);
+
+    interface Cache<K, V> {
+        V get(K key);
+    }
+
+    static String compileKey(List<String> args) {
+        return compileKey(args.toArray(new String[0]));
+    }
+
+    static String compileKey(String... args) {
+        return Stream.of(args).map(arg->defaultIfNull(arg, "")).collect( Collectors.joining( KEY_DELIMITER ) );
+    }
+
+    static String[] decompileKey(String key) {
+        return key.split(KEY_DELIMITER);
+    }
+}