HBASE-11819 Unit test for CoprocessorHConnection (Talat Uyarer)

hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorHConnection.java

@@ -0,0 +1,162 @@
+/**
+ * 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.
+ */
+
+package org.apache.hadoop.hbase.coprocessor;
+
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import java.io.IOException;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.hbase.Coprocessor;
+import org.apache.hadoop.hbase.CoprocessorEnvironment;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.MiniHBaseCluster;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.ClusterConnection;
+import org.apache.hadoop.hbase.client.Connection;
+import org.apache.hadoop.hbase.client.ConnectionFactory;
+import org.apache.hadoop.hbase.client.CoprocessorHConnection;
+import org.apache.hadoop.hbase.client.Get;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.Table;
+import org.apache.hadoop.hbase.regionserver.HRegion;
+import org.apache.hadoop.hbase.testclassification.CoprocessorTests;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category({CoprocessorTests.class, MediumTests.class})
+public class TestCoprocessorHConnection {
+
+  static final Log LOG = LogFactory.getLog(TestCoprocessorHConnection.class);
+
+  public final static byte[] A = Bytes.toBytes("a");
+  private static final int ROWSIZE = 20;
+  private static final byte[] rowSeperator1 = Bytes.toBytes(5);
+  private static final byte[] rowSeperator2 = Bytes.toBytes(12);
+  
+  private static HBaseTestingUtility util = new HBaseTestingUtility();
+  private static MiniHBaseCluster cluster = null;
+
+  public static class FooCoprocessor extends BaseRegionObserver {
+    private HRegion region;
+    private ClusterConnection conn;
+    private CoprocessorEnvironment env;
+    
+    @Override
+    public void start(CoprocessorEnvironment e) {
+      region = ((RegionCoprocessorEnvironment)e).getRegion();
+      env = e;
+    }
+    @Override
+    public void stop(CoprocessorEnvironment e) {
+      region = null;
+    }
+    
+    public byte[] getRegionStartKey() {
+      return region.getStartKey();
+    }
+    
+    public Result getOnCoprocessorHConnection(TableName tableName, byte[] key)
+        throws IOException {
+      conn = CoprocessorHConnection.getConnectionForEnvironment(env);
+      Table hTable = conn.getTable(tableName);
+      Get get = new Get(key);
+      Result result = hTable.get(get);
+      return result;
+    }
+  }
+  
+  @BeforeClass
+  public static void setupBeforeClass() throws Exception {
+    util.startMiniCluster();
+    cluster = util.getMiniHBaseCluster();
+  }
+
+  @AfterClass
+  public static void tearDownAfterClass() throws Exception {
+    util.shutdownMiniCluster();
+  }
+
+  @Test
+  public void testHConnection() throws Exception {
+    Admin admin = util.getHBaseAdmin();
+    TableName testTable = TableName.valueOf("TestHConnection");
+
+    try {
+      // Check table exists
+      if (admin.tableExists(testTable)) {
+        admin.disableTable(testTable);
+        admin.deleteTable(testTable);
+      }
+
+      HTableDescriptor htd = new HTableDescriptor(testTable);
+      htd.addFamily(new HColumnDescriptor(A));
+
+      // Register FooCoprocessor as a table coprocessor
+      htd.addCoprocessor(FooCoprocessor.class.getName());
+
+      // Create a table with 3 region
+      admin.createTable(htd, new byte[][] { rowSeperator1, rowSeperator2 });
+      util.waitUntilAllRegionsAssigned(testTable);
+    } finally {
+      admin.close();
+    }
+
+    //Create Connection and get Table
+    Connection connection = ConnectionFactory.createConnection(util.getConfiguration());
+    Table table = connection.getTable(testTable);
+
+    try{
+      // Put some data
+      for (long i = 0; i < ROWSIZE; i++) {
+        byte[] iBytes = Bytes.toBytes(i);
+        Put put = new Put(iBytes);
+        put.add(A, A, iBytes);
+        table.put(put);
+      }
+
+      // Get Table's First Region
+      HRegion firstRegion = cluster.getRegions(testTable).get(0);
+
+      // Look up the coprocessor instance running the Region
+      Coprocessor cp = firstRegion.getCoprocessorHost().findCoprocessor(FooCoprocessor.class.getName());
+      assertNotNull("FooCoprocessor coprocessor should be loaded", cp);
+      FooCoprocessor fc = (FooCoprocessor) cp;
+
+      // Find the start key for the region that FooCoprocessor is running on.
+      byte[] regionStartKey = fc.getRegionStartKey();
+ 
+      // Get Key Data
+      Get get =  new Get(regionStartKey);
+      Result keyData = table.get(get);
+
+      // Get Key Data using with CoprocessorHConnection
+      Result cpData = fc.getOnCoprocessorHConnection(testTable, regionStartKey);
+      // Check them equals
+      assertEquals(keyData.getValue(A, A), cpData.getValue(A, A));
+    } finally {
+      table.close();
+      connection.close();
+    }
+  }
+}