/*
 * 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.rest.client;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.io.IOException;
import java.util.regex.Pattern;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.testclassification.RestTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;

/**
 * Tests {@link RemoteAdmin} retries.
 */
@Category({RestTests.class, SmallTests.class})
public class TestRemoteAdminRetries {

  private static final int SLEEP_TIME = 50;
  private static final int RETRIES = 3;
  private static final long MAX_TIME = SLEEP_TIME * (RETRIES - 1);
  
  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  
  private RemoteAdmin remoteAdmin;
  private Client client;

  @Before
  public void setup() throws Exception {
    client = mock(Client.class);
    Response response = new Response(509);
    when(client.get(anyString(), anyString())).thenReturn(response);
    when(client.delete(anyString())).thenReturn(response);
    when(client.put(anyString(), anyString(), any(byte[].class))).thenReturn(response);
    when(client.post(anyString(), anyString(), any(byte[].class))).thenReturn(response);
    Configuration configuration = TEST_UTIL.getConfiguration();

    configuration.setInt("hbase.rest.client.max.retries", RETRIES);
    configuration.setInt("hbase.rest.client.sleep", SLEEP_TIME);

    remoteAdmin = new RemoteAdmin(client, TEST_UTIL.getConfiguration(), "MyTable");
  }

  @Test
  public void testFailingGetRestVersion() throws Exception  {
    testTimedOutGetCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.getRestVersion();
      }
    });
  }
  
  @Test
  public void testFailingGetClusterStatus() throws Exception  {
    testTimedOutGetCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.getClusterStatus();
      }
    });
  }

  @Test
  public void testFailingGetClusterVersion() throws Exception {
    testTimedOutGetCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.getClusterVersion();
      }
    });
  }

  @Test
  public void testFailingGetTableAvailable() throws Exception {
    testTimedOutCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.isTableAvailable(Bytes.toBytes("TestTable"));
      }
    });
  }

  @Test
  @SuppressWarnings("deprecation")
  public void testFailingCreateTable() throws Exception {
    testTimedOutCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.createTable(new HTableDescriptor(TableName.valueOf("TestTable")));
      }
    });
    verify(client, times(RETRIES)).put(anyString(), anyString(), any(byte[].class));
  }

  @Test
  public void testFailingDeleteTable() throws Exception {
    testTimedOutCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.deleteTable("TestTable");
      }
    });
    verify(client, times(RETRIES)).delete(anyString());
  }

  @Test
  public void testFailingGetTableList() throws Exception {
    testTimedOutGetCall(new CallExecutor() {
      @Override
      public void run() throws Exception {
        remoteAdmin.getTableList();
      }
    });
  }
  
  private void testTimedOutGetCall(CallExecutor callExecutor) throws Exception {
    testTimedOutCall(callExecutor);
    verify(client, times(RETRIES)).get(anyString(), anyString());
  }
  
  private void testTimedOutCall(CallExecutor callExecutor) throws Exception {
    long start = System.currentTimeMillis();
    try {
      callExecutor.run();
      fail("should be timeout exception!");
    } catch (IOException e) {
      assertTrue(Pattern.matches(".*MyTable.*timed out", e.toString()));
    }
    assertTrue((System.currentTimeMillis() - start) > MAX_TIME);
  }

  private static interface CallExecutor {
    void run() throws Exception;
  }
  
}