SPI implementation

src/main/java/net/openhft/chronicle/hash/HashQueryContext.java

@@ -0,0 +1,25 @@
+package net.openhft.chronicle.hash;
+
+import net.openhft.chronicle.hash.locks.InterProcessReadWriteUpdateLock;
+
+public interface HashQueryContext<K> extends HashContext<K>, InterProcessReadWriteUpdateLock {
+
+    /**
+     * Returns the queried key as a {@code Value}.
+     */
+    Value<K, ?> queriedKey();
+
+    /**
+     * Returns the entry access object, if the entry with the queried key is <i>present</i>
+     * in the hash, returns {@code null} is the entry is <i>absent</i>. Might acquire
+     * {@link #readLock} before searching for the key, if the context is not locked yet.
+     */
+    HashEntry<K> entry();
+
+    /**
+     * Returns the special <i>absent entry</i> object, if the entry with the queried key
+     * is <i>absent</i> in the hash, returns {@code null}, if the entry is <i>present</i>. Might
+     * acquire {@link #readLock} before searching for the key, if the context is not locked yet.
+     */
+    HashAbsentEntry<K> absentEntry();
+}