在使用Astyanax进行写操作时,可以使用"default_time_to_live"参数来设置过期时间。
下面是一个使用Astyanax进行写操作并设置"default_time_to_live"参数的示例代码:
import com.netflix.astyanax.AstyanaxContext;
import com.netflix.astyanax.Keyspace;
import com.netflix.astyanax.MutationBatch;
import com.netflix.astyanax.connectionpool.exceptions.ConnectionException;
import com.netflix.astyanax.model.ColumnFamily;
import com.netflix.astyanax.model.ColumnList;
import com.netflix.astyanax.model.CqlResult;
import com.netflix.astyanax.serializers.StringSerializer;
import com.netflix.astyanax.thrift.ThriftFamilyFactory;
public class AstyanaxExample {
private static final String HOST = "localhost";
private static final String CLUSTER_NAME = "Test Cluster";
private static final String KEYSPACE_NAME = "my_keyspace";
private static final String COLUMN_FAMILY_NAME = "my_column_family";
private static final int DEFAULT_TIME_TO_LIVE = 3600; // 设置默认过期时间为1小时
public static void main(String[] args) throws ConnectionException {
// 创建Astyanax上下文
AstyanaxContext context = new AstyanaxContext.Builder()
.forCluster(CLUSTER_NAME)
.forKeyspace(KEYSPACE_NAME)
.withAstyanaxConfiguration(new AstyanaxConfigurationImpl()
.setDiscoveryType(NodeDiscoveryType.RING_DESCRIBE)
.setCqlVersion("3.0.0")
.setDefaultReadConsistencyLevel(ConsistencyLevel.CL_ONE)
.setDefaultWriteConsistencyLevel(ConsistencyLevel.CL_ONE)
)
.withConnectionPoolConfiguration(new ConnectionPoolConfigurationImpl("MyConnectionPool")
.setPort(9160)
.setMaxConnsPerHost(1)
.setSeeds(HOST)
)
.withConnectionPoolMonitor(new CountingConnectionPoolMonitor())
.buildKeyspace(ThriftFamilyFactory.getInstance());
// 初始化Astyanax上下文
context.start();
Keyspace keyspace = context.getClient();
// 创建ColumnFamily
ColumnFamily columnFamily = new ColumnFamily<>(
COLUMN_FAMILY_NAME,
StringSerializer.get(),
StringSerializer.get());
// 创建MutationBatch
MutationBatch mutationBatch = keyspace.prepareMutationBatch();
// 设置写入数据和过期时间
mutationBatch.withRow(columnFamily, "row_key")
.putColumn("column_name", "column_value", DEFAULT_TIME_TO_LIVE);
// 执行写入操作
mutationBatch.execute();
// 读取数据
ColumnList result = keyspace.prepareQuery(columnFamily)
.getKey("row_key")
.execute().getResult();
// 输出结果
System.out.println(result.getStringValue("column_name", null));
// 关闭Astyanax上下文
context.shutdown();
}
}
在上述代码中,我们使用MutationBatch
对象来准备写入操作,并使用withRow
方法设置写入的行和列。在putColumn
方法中,我们传入了过期时间DEFAULT_TIME_TO_LIVE
来设置数据的生存时间。最后,我们使用execute
方法执行写入操作。
请注意,这只是一个示例代码,你需要根据你的实际需求进行适当的修改和配置。