Add an EstimateHistogramWrapper

The EstimatedHistogramWrapper is a helper class that holds the API
related data, so that a class that uses an EstimatedHistogram can
replace it with the wrapper and keep most of its code as is.

Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>

src/main/java/org/apache/cassandra/metrics/EstimatedHistogramWrapper.java

@@ -0,0 +1,55 @@
+package org.apache.cassandra.metrics;
+/*
+ * Copyright (C) 2015 ScyllaDB
+ */
+
+/*
+ * This file is part of Scylla.
+ *
+ * Scylla is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Scylla is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import javax.ws.rs.core.MultivaluedMap;
+
+import com.cloudius.urchin.api.APIClient;
+import com.cloudius.urchin.utils.EstimatedHistogram;
+
+public class EstimatedHistogramWrapper {
+    private APIClient c = new APIClient();
+    private String url;
+    private MultivaluedMap<String, String> queryParams;
+    private static final int DURATION = 50;
+    private int duration;
+    public EstimatedHistogramWrapper(String url, MultivaluedMap<String, String> queryParams, int duration) {
+        this.url = url;
+        this.queryParams = queryParams;
+        this.duration = duration;
+
+    }
+    public EstimatedHistogramWrapper(String url) {
+        this(url, null, DURATION);
+
+    }
+    public EstimatedHistogramWrapper(String url, int duration) {
+        this(url, null, duration);
+
+    }
+    public EstimatedHistogram get() {
+        return c.getEstimatedHistogram(url, queryParams, duration);
+    }
+
+    public long[] getBuckets(boolean reset) {
+        return get().getBuckets(reset);
+    }
+}