/**
 * 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.flume.node;

import junit.framework.Assert;

import org.apache.flume.conf.FlumeConfiguration;
import org.apache.flume.conf.FlumeConfiguration.AgentConfiguration;
import org.apache.flume.lifecycle.LifecycleController;
import org.apache.flume.lifecycle.LifecycleState;
import org.junit.Test;

import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;

public class TestPollingZooKeeperConfigurationProvider extends
    TestAbstractZooKeeperConfigurationProvider {

  private EventBus eb;

  private EventSync es;

  private PollingZooKeeperConfigurationProvider cp;

  private class EventSync {

    private boolean notified;

    @Subscribe
    public synchronized void notifyEvent(MaterializedConfiguration mConfig) {
      notified = true;
      notifyAll();
    }

    public synchronized void awaitEvent() throws InterruptedException {
      while (!notified) {
        wait();
      }
    }

    public synchronized void reset() {
      notified = false;
    }
  }

  @Override
  protected void doSetUp() throws Exception {
    eb = new EventBus("test");
    es = new EventSync();
    es.reset();
    eb.register(es);
    cp = new PollingZooKeeperConfigurationProvider(AGENT_NAME, "localhost:"
        + zkServer.getPort(), null, eb);
    cp.start();
    LifecycleController.waitForOneOf(cp, LifecycleState.START_OR_ERROR);
  }

  @Override
  protected void doTearDown() throws Exception {
    // do nothing
  }

  @Test
  public void testPolling() throws Exception {
    es.awaitEvent();
    es.reset();

    FlumeConfiguration fc = cp.getFlumeConfiguration();
    Assert.assertTrue(fc.getConfigurationErrors().isEmpty());
    AgentConfiguration ac = fc.getConfigurationFor(AGENT_NAME);
    Assert.assertNull(ac);

    addData();
    es.awaitEvent();
    es.reset();

    verifyProperties(cp);
  }
}
