/**
* Test concurrent reader and writer (GH-458).
*
* <p><b>Test case:</b>
*
* <ol>
* <li/>start a long running reader;
* <li/>try to start a writer: it should time out;
* <li/>stop the reader;
* <li/>start the writer again: it should succeed.
* </ol>
*
* @throws Exception error during request execution
*/
@Test
@Ignore("There is no way to stop a query on the server!")
public void testReaderWriter() throws Exception {
final String readerQuery = "?query=(1%20to%20100000000000000)%5b.=1%5d";
final String writerQuery = "/test.xml";
final byte[] content = Token.token("<a/>");
final Get readerAction = new Get(readerQuery);
final Put writerAction = new Put(writerQuery, content);
final ExecutorService exec = Executors.newFixedThreadPool(2);
// start reader
exec.submit(readerAction);
Performance.sleep(TIMEOUT); // delay in order to be sure that the reader has started
// start writer
Future<HTTPResponse> writer = exec.submit(writerAction);
try {
final HTTPResponse result = writer.get(TIMEOUT, TimeUnit.MILLISECONDS);
if (result.status.isSuccess()) fail("Database modified while a reader is running");
throw new Exception(result.toString());
} catch (final TimeoutException e) {
// writer is blocked by the reader: stop it
writerAction.stop = true;
}
// stop reader
readerAction.stop = true;
// start the writer again
writer = exec.submit(writerAction);
assertEquals(HTTPCode.CREATED, writer.get().status);
}
/**
* Test concurrent writers (GH-458).
*
* <p><b>Test case:</b>
*
* <ol>
* <li/>start several writers one after another;
* <li/>all writers should succeed.
* </ol>
*
* @throws Exception error during request execution
*/
@Test
public void testMultipleWriters() throws Exception {
final int count = 10;
final String template =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
+ "<command xmlns=\"http://basex.org/rest\"><text><![CDATA["
+ "ADD TO %1$d <node id=\"%1$d\"/>"
+ "]]></text></command>";
@SuppressWarnings("unchecked")
final Future<HTTPResponse>[] tasks = new Future[count];
final ExecutorService exec = Executors.newFixedThreadPool(count);
// start all writers (not at the same time, but still in parallel)
for (int i = 0; i < count; i++) {
final String command = String.format(template, i);
tasks[i] = exec.submit(new Post("", Token.token(command)));
}
// check if all have finished successfully
for (final Future<HTTPResponse> task : tasks) {
assertEquals(HTTPCode.OK, task.get(TIMEOUT, TimeUnit.MILLISECONDS).status);
}
}