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ObjectBox example: Cache query and multi-threaded usage of cached query
package io.objectbox.test.stress;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import io.objectbox.Box;
import io.objectbox.BoxStore;
import io.objectbox.query.Query;
public class Stresser {
static final boolean VERBOSE = false;
private final BoxStore store;
private final Query<TempData> findFirstQuery;
ThreadPoolExecutor pool;
public Stresser(BoxStore store) { = store;
findFirstQuery = store.boxFor(TempData.class).query().equal(TempData_.longVal, 0L).build();
// Originally at 128 threads, decrease to go well with default value of readers
pool = new ThreadPoolExecutor(5, 100, 7L, TimeUnit.SECONDS, new OfferLinkedBlockingQueue());
protected void runFindFirstQueries() {
for (int i = 0; i < 2000; i++) {
final int j = i;
Runnable r = new Runnable() {
public void run() {
TempData data;
synchronized (findFirstQuery) {
data = findFirstQuery.setParameter(TempData_.longVal, (long) j).findFirst();
if (VERBOSE) System.out.println(data);
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