How to use

HasMasterServices

in

org.apache.hadoop.hbase.coprocessor

@Override
public void start(CoprocessorEnvironment env) throws IOException {
 if (!(env instanceof HasMasterServices)) {
  throw new IOException("Does not implement HMasterServices");
 }
 master = ((HasMasterServices)env).getMasterServices();
 groupInfoManager = RSGroupInfoManagerImpl.getInstance(master);
 groupAdminServer = new RSGroupAdminServer(master, groupInfoManager);
 Class<?> clazz =
   master.getConfiguration().getClass(HConstants.HBASE_MASTER_LOADBALANCER_CLASS, null);
 if (!RSGroupableBalancer.class.isAssignableFrom(clazz)) {
  throw new IOException("Configured balancer does not support RegionServer groups.");
 }
 ZKWatcher zk = ((HasMasterServices)env).getMasterServices().getZooKeeper();
 accessChecker = new AccessChecker(env.getConfiguration(), zk);
 // set the user-provider.
 this.userProvider = UserProvider.instantiate(env.getConfiguration());
}

 /**
  * Assert that when a Coprocessor is annotated with CoreCoprocessor, then it is possible to
  * access a MasterServices instance. Assert the opposite too.
  * Do it to MasterCoprocessors.
  * @throws IOException
  */
 @Test
 public void testCoreRegionCoprocessor() throws IOException {
  MasterCoprocessorEnvironment env =
    this.mch.load(null, NotCoreMasterCoprocessor.class.getName(), 0, HTU.getConfiguration());
  assertFalse(env instanceof HasMasterServices);
  env = this.mch.load(null, CoreMasterCoprocessor.class.getName(), 1, HTU.getConfiguration());
  assertTrue(env instanceof HasMasterServices);
  assertEquals(this.ms, ((HasMasterServices)env).getMasterServices());
 }
}

zk = ((HasMasterServices)mEnv).getMasterServices().getZooKeeper();

@Override
public void start(CoprocessorEnvironment env) throws IOException {
 if (!(env instanceof HasMasterServices)) {
  throw new IOException("Does not implement HMasterServices");
 }
 master = ((HasMasterServices)env).getMasterServices();
 groupInfoManager = RSGroupInfoManagerImpl.getInstance(master);
 groupAdminServer = new RSGroupAdminServer(master, groupInfoManager);
 Class<?> clazz =
   master.getConfiguration().getClass(HConstants.HBASE_MASTER_LOADBALANCER_CLASS, null);
 if (!RSGroupableBalancer.class.isAssignableFrom(clazz)) {
  throw new IOException("Configured balancer does not support RegionServer groups.");
 }
 ZKWatcher zk = ((HasMasterServices)env).getMasterServices().getZooKeeper();
 accessChecker = new AccessChecker(env.getConfiguration(), zk);
 // set the user-provider.
 this.userProvider = UserProvider.instantiate(env.getConfiguration());
}

@Override
public void start(CoprocessorEnvironment env) throws IOException {
 if (!(env instanceof HasMasterServices)) {
  throw new IOException("Does not implement HMasterServices");
 }
 master = ((HasMasterServices)env).getMasterServices();
 groupInfoManager = RSGroupInfoManagerImpl.getInstance(master);
 groupAdminServer = new RSGroupAdminServer(master, groupInfoManager);
 Class<?> clazz =
   master.getConfiguration().getClass(HConstants.HBASE_MASTER_LOADBALANCER_CLASS, null);
 if (!RSGroupableBalancer.class.isAssignableFrom(clazz)) {
  throw new IOException("Configured balancer does not support RegionServer groups.");
 }
 ZKWatcher zk = ((HasMasterServices)env).getMasterServices().getZooKeeper();
 accessChecker = new AccessChecker(env.getConfiguration(), zk);
 // set the user-provider.
 this.userProvider = UserProvider.instantiate(env.getConfiguration());
}

 /**
  * Assert that when a Coprocessor is annotated with CoreCoprocessor, then it is possible to
  * access a MasterServices instance. Assert the opposite too.
  * Do it to MasterCoprocessors.
  * @throws IOException
  */
 @Test
 public void testCoreRegionCoprocessor() throws IOException {
  MasterCoprocessorEnvironment env =
    this.mch.load(null, NotCoreMasterCoprocessor.class.getName(), 0, HTU.getConfiguration());
  assertFalse(env instanceof HasMasterServices);
  env = this.mch.load(null, CoreMasterCoprocessor.class.getName(), 1, HTU.getConfiguration());
  assertTrue(env instanceof HasMasterServices);
  assertEquals(this.ms, ((HasMasterServices)env).getMasterServices());
 }
}