[
https://issues.apache.org/jira/browse/CASSANDRA-740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828248#action_12828248
]
Ran Tavory commented on CASSANDRA-740:
--------------------------------------
An embedded cassandra server is useful for testing apps that use cassandra, not
cassandra itself.
I've actually developed this for my own use and then posted it on the mailing
list so I was asked to make that available publicly. I think contrib is a
suitable place for it (and I consulted Jonathan about this).
By having an embedded cassandra server in your unit tests it's very easy to
start a clean cassandra instance, run your tests independently of other
developers and clean up after they finish. I use it on my day to day job and
find it very useful.
> Create InProcessCassandraServer for unit tests
> ----------------------------------------------
>
> Key: CASSANDRA-740
> URL: https://issues.apache.org/jira/browse/CASSANDRA-740
> Project: Cassandra
> Issue Type: New Feature
> Components: Contrib
> Reporter: Ran Tavory
> Assignee: Ran Tavory
> Priority: Minor
> Attachments: CASSANDRA-740.patch, CASSANDRA-740.patch
>
>
> I've been personally using an in-process cassandra server and found it useful
> so I was ask to make it available publicly, here goes.
> When unit-testing with cassandra I create an in process cassandra instance.
> That's nice since it lets you isolate tests, and you don't have to worry
> about a server being available for your unit tests.
> The code goes more or less like this (I'll attach a patch when the work is
> done after cleanup etc)
> /**
> * An in-memory cassandra storage service that listens to the thrift
> interface.
> * Useful for unit testing,
> *
> * @author Ran Tavory ([email protected])
> *
> */
> public class InProcessCassandraServer implements Runnable {
> private static final Logger log =
> LoggerFactory.getLogger(InProcessCassandraServer.class);
> CassandraDaemon cassandraDaemon;
> public void init() {
> try {
> prepare();
> } catch (IOException e) {
> log.error("Cannot prepare cassandra.", e);
> }
> try {
> cassandraDaemon = new CassandraDaemon();
> cassandraDaemon.init(null);
> } catch (TTransportException e) {
> log.error("TTransportException", e);
> } catch (IOException e) {
> log.error("IOException", e);
> }
> }
> @Override
> public void run() {
> cassandraDaemon.start();
> }
> public void stop() {
> cassandraDaemon.stop();
> rmdir("tmp");
> }
> /**
> * Creates all files and directories needed
> * @throws IOException
> */
> private void prepare() throws IOException {
> // delete tmp dir first
> rmdir("tmp");
> // make a tmp dir and copy storag-conf.xml and log4j.properties to it
> copy("/cassandra/storage-conf.xml", "tmp");
> copy("/cassandra/log4j.properties", "tmp");
> System.setProperty("storage-config", "tmp");
> // make cassandra directories.
> for (String s: DatabaseDescriptor.getAllDataFileLocations()) {
> mkdir(s);
> }
> mkdir(DatabaseDescriptor.getBootstrapFileLocation());
> mkdir(DatabaseDescriptor.getLogFileLocation());
> }
> /**
> * Copies a resource from within the jar to a directory.
> *
> * @param resourceName
> * @param directory
> * @throws IOException
> */
> private void copy(String resource, String directory) throws IOException {
> mkdir(directory);
> InputStream is = getClass().getResourceAsStream(resource);
> String fileName = resource.substring(resource.lastIndexOf("/") + 1);
> File file = new File(directory + System.getProperty("file.separator") +
> fileName);
> OutputStream out = new FileOutputStream(file);
> byte buf[] = new byte[1024];
> int len;
> while ((len = is.read(buf)) > 0) {
> out.write(buf, 0, len);
> }
> out.close();
> is.close();
> }
> /**
> * Creates a directory
> * @param dir
> * @throws IOException
> */
> private void mkdir(String dir) throws IOException {
> FileUtils.createDirectory(dir);
> }
> /**
> * Removes a directory from file system
> * @param dir
> */
> private void rmdir(String dir) {
> FileUtils.deleteDir(new File(dir));
> }
> }
> And test code using this class looks like this:
> public class XxxTest {
> private static InProcessCassandraServer cassandra;
> @BeforeClass
> public static void setup() throws TTransportException, IOException,
> InterruptedException {
> cassandra = new InProcessCassandraServer();
> cassandra.init();
> Thread t = new Thread(cassandra);
> t.setDaemon(true);
> t.start();
> }
> @AfterClass
> public static void shutdown() {
> cassandra.stop();
> }
> public void testX() {
> // connect to cassandra at localhost:9160
> }
> }
> note: I've set Fix Version to 6.0, hope it's correct
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
