/*
 * 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.flink.streaming.connectors.cassandra;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.java.tuple.Tuple0;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.apache.flink.streaming.runtime.operators.CheckpointCommitter;
import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;

import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.ResultSetFuture;
import com.datastax.driver.core.Session;
import org.junit.Test;
import org.mockito.Matchers;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.util.Collections;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicReference;

import static org.junit.Assert.assertFalse;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.powermock.api.mockito.PowerMockito.doAnswer;
import static org.powermock.api.mockito.PowerMockito.mock;
import static org.powermock.api.mockito.PowerMockito.when;

/**
 * Tests for the {@link CassandraTupleWriteAheadSink}.
 */
public class CassandraTupleWriteAheadSinkTest {

	@Test(timeout = 20000)
	public void testAckLoopExitOnException() throws Exception {
		final AtomicReference<Runnable> runnableFuture = new AtomicReference<>();

		final ClusterBuilder clusterBuilder = new ClusterBuilder() {
			private static final long serialVersionUID = 4624400760492936756L;

			@Override
			protected Cluster buildCluster(Cluster.Builder builder) {
				try {
					BoundStatement boundStatement = mock(BoundStatement.class);
					when(boundStatement.setDefaultTimestamp(any(long.class))).thenReturn(boundStatement);

					PreparedStatement preparedStatement = mock(PreparedStatement.class);
					when(preparedStatement.bind(Matchers.anyVararg())).thenReturn(boundStatement);

					ResultSetFuture future = mock(ResultSetFuture.class);
					when(future.get()).thenThrow(new RuntimeException("Expected exception."));

					doAnswer(new Answer<Void>() {
						@Override
						public Void answer(InvocationOnMock invocationOnMock) throws Throwable {
							synchronized (runnableFuture) {
								runnableFuture.set((((Runnable) invocationOnMock.getArguments()[0])));
								runnableFuture.notifyAll();
							}
							return null;
						}
					}).when(future).addListener(any(Runnable.class), any(Executor.class));

					Session session = mock(Session.class);
					when(session.prepare(anyString())).thenReturn(preparedStatement);
					when(session.executeAsync(any(BoundStatement.class))).thenReturn(future);

					Cluster cluster = mock(Cluster.class);
					when(cluster.connect()).thenReturn(session);
					return cluster;
				} catch (Exception e) {
					throw new RuntimeException(e);
				}
			}
		};

		// Our asynchronous executor thread
		new Thread(new Runnable() {
			@Override
			public void run() {
				synchronized (runnableFuture) {
					while (runnableFuture.get() == null) {
						try {
							runnableFuture.wait();
						} catch (InterruptedException e) {
							// ignore interrupts
						}
					}
				}
				runnableFuture.get().run();
			}
		}).start();

		CheckpointCommitter cc = mock(CheckpointCommitter.class);
		final CassandraTupleWriteAheadSink<Tuple0> sink = new CassandraTupleWriteAheadSink<>(
			"abc",
			TupleTypeInfo.of(Tuple0.class).createSerializer(new ExecutionConfig()),
			clusterBuilder,
			cc
		);

		OneInputStreamOperatorTestHarness<Tuple0, Tuple0> harness = new OneInputStreamOperatorTestHarness<>(sink);
		harness.getEnvironment().getTaskConfiguration().setBoolean("checkpointing", true);

		harness.setup();
		sink.open();

		// we should leave the loop and return false since we've seen an exception
		assertFalse(sink.sendValues(Collections.singleton(new Tuple0()), 1L, 0L));

		sink.close();
	}
}