/**
* 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);
}
@Override
public void execute(final GUI gui) {
final DialogExport dialog = new DialogExport(gui);
if (!dialog.ok()) return;
final IOFile root = new IOFile(dialog.path());
// check if existing files will be overwritten
if (root.exists()) {
IO file = null;
boolean overwrite = false;
final Data d = gui.context.data();
final IntList il = d.resources.docs();
final int is = il.size();
for (int i = 0; i < is; i++) {
file = root.merge(Token.string(d.text(il.get(i), true)));
if (file.exists()) {
if (overwrite) {
// more than one file will be overwritten; check remaining tests
file = null;
break;
}
overwrite = true;
}
}
if (overwrite) {
// show message for overwriting files or directories
final String msg = file == null ? FILES_REPLACE_X : FILE_EXISTS_X;
if (file == null) file = root;
if (!BaseXDialog.confirm(gui, Util.info(msg, file))) return;
}
}
DialogProgress.execute(gui, new Export(root.path()));
}
@Override
public void execute(final GUI gui) {
final int pre = gui.context.marked.pres[0];
final byte[] txt = ViewData.path(gui.context.data(), pre);
// copy path to clipboard
final Clipboard clip = Toolkit.getDefaultToolkit().getSystemClipboard();
clip.setContents(new StringSelection(Token.string(txt)), null);
}
/**
* Calculates the text offset and writes the text value.
*
* @param value value to be inlined
* @param text text/attribute flag
* @return inline value or text position
* @throws IOException I/O exception
*/
private long textOff(final byte[] value, final boolean text) throws IOException {
// inline integer values...
final long v = Token.toSimpleInt(value);
if (v != Integer.MIN_VALUE) return v | IO.OFFNUM;
// store text
final DataOutput store = text ? xout : vout;
final long off = store.size();
final byte[] val = COMP.get().pack(value);
store.writeToken(val);
return val == value ? off : off | IO.OFFCOMP;
}
@Override
public void execute(final GUI gui) {
final Nodes n = gui.context.marked;
final DialogInsert insert = new DialogInsert(gui);
if (!insert.ok()) return;
final StringList sl = insert.result;
final NodeType type = ANode.type(insert.kind);
String item = Token.string(type.string()) + " { " + quote(sl.get(0)) + " }";
if (type == NodeType.ATT || type == NodeType.PI) {
item += " { " + quote(sl.get(1)) + " }";
} else if (type == NodeType.ELM) {
item += " { () }";
}
gui.context.copied = null;
gui.execute(new XQuery("insert node " + item + " into " + openPre(n, 0)));
}
/**
* 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);
}
}