public synchronized QueryExplanation explain() throws BeeswaxException {
assertState(QueryState.INITIALIZED);
// By manipulating the query, this will make errors harder to find.
query.query = "EXPLAIN " + query.query;
checkedCompile();
int ret;
if (0 != (ret = driver.execute())) {
throwException(new RuntimeException("Failed to execute: EXPLAIN " + ret));
}
StringBuilder sb = new StringBuilder();
ArrayList<String> v = new ArrayList<String>();
try {
while (driver.getResults(v)) {
for (String s : v) {
sb.append(s);
sb.append("\n");
}
v.clear();
}
} catch (IOException e) {
throwException(new RuntimeException(e));
} finally {
// Don't let folks re-use the state object.
state = QueryState.FINISHED;
}
return new QueryExplanation(sb.toString());
}
/**
* Executes query. Updates state. (QueryState variable can be polled.)
*
* @throws BeeswaxException
*/
public void execute() throws BeeswaxException {
synchronized (this) {
assertState(QueryState.COMPILED);
state = QueryState.RUNNING;
}
int ret = driver.execute();
try {
synchronized (this) {
assertState(QueryState.RUNNING);
if (ret == 0) {
state = QueryState.FINISHED;
} else {
throwException(
new BeeswaxException(
"Driver returned: " + ret + ". Errors: " + getErrorStreamAsString(),
logContext.getName(),
this.handle));
}
}
} finally {
notifyDone(this);
}
}
