Importing CompactionHistoryTabularData from origin

This patch import and modify CompactionHistoryTabularData from origin.
It will be used by the getCompactionHistory method in CompactionManager.

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

src/main/java/org/apache/cassandra/db/compaction/CompactionHistoryTabularData.java

@@ -0,0 +1,106 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * Copyright 2015 ScyllaDB
+ *
+ * Modified by ScyllaDB
+ */
+package org.apache.cassandra.db.compaction;
+
+import javax.json.JsonArray;
+import javax.json.JsonObject;
+import javax.management.openmbean.CompositeDataSupport;
+import javax.management.openmbean.CompositeType;
+import javax.management.openmbean.OpenDataException;
+import javax.management.openmbean.OpenType;
+import javax.management.openmbean.SimpleType;
+import javax.management.openmbean.TabularData;
+import javax.management.openmbean.TabularDataSupport;
+import javax.management.openmbean.TabularType;
+
+import com.google.common.base.Throwables;
+
+public class CompactionHistoryTabularData {
+    private static final String[] ITEM_NAMES = new String[] { "id",
+            "keyspace_name", "columnfamily_name", "compacted_at", "bytes_in",
+            "bytes_out", "rows_merged" };
+
+    private static final String[] ITEM_DESCS = new String[] { "time uuid",
+            "keyspace name", "column family name", "compaction finished at",
+            "total bytes in", "total bytes out", "total rows merged" };
+
+    private static final String TYPE_NAME = "CompactionHistory";
+
+    private static final String ROW_DESC = "CompactionHistory";
+
+    private static final OpenType<?>[] ITEM_TYPES;
+
+    private static final CompositeType COMPOSITE_TYPE;
+
+    private static final TabularType TABULAR_TYPE;
+
+    static {
+        try {
+            ITEM_TYPES = new OpenType[] { SimpleType.STRING, SimpleType.STRING,
+                    SimpleType.STRING, SimpleType.LONG, SimpleType.LONG,
+                    SimpleType.LONG, SimpleType.STRING };
+
+            COMPOSITE_TYPE = new CompositeType(TYPE_NAME, ROW_DESC, ITEM_NAMES,
+                    ITEM_DESCS, ITEM_TYPES);
+
+            TABULAR_TYPE = new TabularType(TYPE_NAME, ROW_DESC, COMPOSITE_TYPE,
+                    ITEM_NAMES);
+        } catch (OpenDataException e) {
+            throw Throwables.propagate(e);
+        }
+    }
+
+    public static TabularData from(JsonArray resultSet)
+            throws OpenDataException {
+        TabularDataSupport result = new TabularDataSupport(TABULAR_TYPE);
+        for (int i = 0; i < resultSet.size(); i++) {
+            JsonObject row = resultSet.getJsonObject(i);
+            String id = row.getString("id");
+            String ksName = row.getString("ks");
+            String cfName = row.getString("cf");
+            long compactedAt = row.getJsonNumber("compacted_at").longValue();
+            long bytesIn = row.getJsonNumber("bytes_in").longValue();
+            long bytesOut = row.getJsonNumber("bytes_out").longValue();
+
+            JsonArray merged = row.getJsonArray("rows_merged");
+            StringBuilder sb = new StringBuilder();
+            if (merged != null) {
+                sb.append('{');
+                for (int m = 0; m < merged.size(); m++) {
+                    JsonObject entry = merged.getJsonObject(m);
+                    if (m > 0) {
+                        sb.append(',');
+                    }
+                    sb.append(entry.getString("key")).append(':')
+                            .append(entry.getString("value"));
+
+                }
+                sb.append('}');
+            }
+            result.put(new CompositeDataSupport(COMPOSITE_TYPE, ITEM_NAMES,
+                    new Object[] { id, ksName, cfName, compactedAt, bytesIn,
+                            bytesOut, sb.toString() }));
+        }
+        return result;
+    }
+}