/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed 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 com.datastax.driver.mapping;
import com.datastax.driver.core.CCMTestsSupport;
import com.datastax.driver.core.GuavaCompatibility;
import com.datastax.driver.core.SimpleStatement;
import com.datastax.driver.core.Statement;
import com.datastax.driver.core.utils.CassandraVersion;
import com.datastax.driver.mapping.annotations.PartitionKey;
import com.datastax.driver.mapping.annotations.Table;
import com.google.common.util.concurrent.AsyncFunction;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Tests that a Result can be paged asynchronously.
*
* @jira_ticket JAVA-1157
*/
@SuppressWarnings("unused")
@CassandraVersion(value = "2.0", description = "uses paging")
public class MapperAsyncResultTest extends CCMTestsSupport {
@Override
public void onTestContextInitialized() {
execute("CREATE TABLE users (id int PRIMARY KEY, name text)");
}
@Table(name = "users")
static class User {
@PartitionKey
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
@BeforeMethod(groups = "short")
public void cleanup() {
session().execute("TRUNCATE users");
}
@Test(groups = "short")
public void should_iterate_single_page_result_set_asynchronously() {
should_iterate_result_set_asynchronously(100, 500);
}
@Test(groups = "short")
public void should_iterate_multi_page_result_set_asynchronously() {
should_iterate_result_set_asynchronously(1000, 20);
}
private void should_iterate_result_set_asynchronously(int totalCount, int fetchSize) {
for (int i = 0; i < totalCount; i++)
session().execute(String.format("INSERT INTO users (id, name) values (%d, '%s')", i, "user" + i));
Statement statement = new SimpleStatement("SELECT * FROM users").setFetchSize(fetchSize);
Mapper<User> mapper = new MappingManager(session()).mapper(User.class);
ResultsAccumulator accumulator = new ResultsAccumulator();
ListenableFuture<Result<User>> results = mapper.mapAsync(session().executeAsync(statement));
ListenableFuture<Result<User>> future = GuavaCompatibility.INSTANCE.transformAsync(
results,
accumulator);
Futures.getUnchecked(future);
assertThat(accumulator.all.size()).isEqualTo(totalCount);
}
/**
* Dummy transformation that accumulates all traversed results
*/
static class ResultsAccumulator implements AsyncFunction<Result<User>, Result<User>> {
final Set<Integer> all = new ConcurrentSkipListSet<Integer>();
@Override
public ListenableFuture<Result<User>> apply(Result<User> users) throws Exception {
int remainingInPage = users.getAvailableWithoutFetching();
for (User user : users) {
all.add(user.getId());
if (--remainingInPage == 0)
break;
}
boolean wasLastPage = users.getExecutionInfo().getPagingState() == null;
if (wasLastPage)
return Futures.immediateFuture(users);
else
return GuavaCompatibility.INSTANCE.transformAsync(users.fetchMoreResults(), this);
}
}
}