1 files changed, 48 insertions, 0 deletions
diff --git a/container-core/src/main/java/com/yahoo/container/logging/CircularArrayAccessLogKeeper.java b/container-core/src/main/java/com/yahoo/container/logging/CircularArrayAccessLogKeeper.java
new file mode 100644
index 00000000000..dc749c71613
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+++ b/container-core/src/main/java/com/yahoo/container/logging/CircularArrayAccessLogKeeper.java
@@ -0,0 +1,48 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.container.logging;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.List;
+
+/**
+ * This class keeps some information from the access log from the requests in memory. It is thread-safe.
+ *
+ * @author dybis
+ */
+public class CircularArrayAccessLogKeeper {
+    public static final int SIZE = 1000;
+    private final Deque<String> uris = new ArrayDeque<>(SIZE);
+    private final Object monitor = new Object();
+
+    /**
+     *  This class is intended to be used with injection so it can be shared between other classes.
+     */
+    public CircularArrayAccessLogKeeper() {}
+
+    /**
+     * Creates a list of Uris.
+     * @return URIs as string
+     */
+    public List<String> getUris() {
+        final List<String> uriList = new ArrayList<>();
+        synchronized (monitor) {
+            uris.iterator().forEachRemaining(uri -> uriList.add(uri));
+        }
+        return uriList;
+    }
+
+    /**
+     * Add a new URI. It might remove an old entry to make space for new entry.
+     * @param uri uri as string
+     */
+    public void addUri(String uri) {
+        synchronized (monitor) {
+            if (uris.size() == SIZE) {
+                uris.pop();
+            }
+            uris.add(uri);
+        }
+    }
+}