Examples with Task org.h2.util.Task used on opensource projects

Example 36 with Task

use of org.h2.util.Task in project h2database by h2database.

the class TestDeadlock method testConcurrentLobReadAndTempResultTableDelete.

private void testConcurrentLobReadAndTempResultTableDelete() throws Exception {
    deleteDb("deadlock");
    String url = "deadlock;MAX_MEMORY_ROWS=10";
    Connection conn, conn2;
    Statement stat2;
    conn = getConnection(url);
    conn2 = getConnection(url);
    final Statement stat = conn.createStatement();
    stat2 = conn2.createStatement();
    stat.execute("create table test(id int primary key, name varchar) as " + "select x, 'Hello' from system_range(1,20)");
    stat2.execute("create table test_clob(id int primary key, data clob) as " + "select 1, space(10000)");
    ResultSet rs2 = stat2.executeQuery("select * from test_clob");
    rs2.next();
    Task t = new Task() {

        @Override
        public void call() throws Exception {
            while (!stop) {
                stat.execute("select * from (select distinct id from test)");
            }
        }
    };
    t.execute();
    long start = System.nanoTime();
    while (System.nanoTime() - start < TimeUnit.SECONDS.toNanos(1)) {
        Reader r = rs2.getCharacterStream(2);
        char[] buff = new char[1024];
        while (true) {
            int x = r.read(buff);
            if (x < 0) {
                break;
            }
        }
    }
    t.get();
    stat.execute("drop all objects");
    conn.close();
    conn2.close();
}

Example 37 with Task

use of org.h2.util.Task in project h2database by h2database.

the class TestExclusive method test.

@Override
public void test() throws Exception {
    deleteDb("exclusive");
    Connection conn = getConnection("exclusive");
    Statement stat = conn.createStatement();
    stat.execute("set exclusive true");
    assertThrows(ErrorCode.DATABASE_IS_IN_EXCLUSIVE_MODE, this).getConnection("exclusive");
    stat.execute("set exclusive false");
    Connection conn2 = getConnection("exclusive");
    final Statement stat2 = conn2.createStatement();
    stat.execute("set exclusive true");
    final AtomicInteger state = new AtomicInteger(0);
    Task task = new Task() {

        @Override
        public void call() throws SQLException {
            stat2.execute("select * from dual");
            if (state.get() != 1) {
                new Error("unexpected state: " + state.get()).printStackTrace();
            }
        }
    };
    task.execute();
    state.set(1);
    stat.execute("set exclusive false");
    task.get();
    stat.execute("set exclusive true");
    conn.close();
    // check that exclusive mode is off when disconnected
    stat2.execute("select * from dual");
    conn2.close();
    deleteDb("exclusive");
}

Example 38 with Task

use of org.h2.util.Task in project h2database by h2database.

the class TestSequence method testConcurrentCreate.

private void testConcurrentCreate() throws Exception {
    deleteDb("sequence");
    final String url = getURL("sequence;MULTI_THREADED=1;LOCK_TIMEOUT=2000", true);
    Connection conn = getConnection(url);
    Task[] tasks = new Task[2];
    try {
        Statement stat = conn.createStatement();
        stat.execute("create table dummy(id bigint primary key)");
        stat.execute("create table test(id bigint primary key)");
        stat.execute("create sequence test_seq cache 2");
        for (int i = 0; i < tasks.length; i++) {
            final int x = i;
            tasks[i] = new Task() {

                @Override
                public void call() throws Exception {
                    try (Connection conn = getConnection(url)) {
                        PreparedStatement prep = conn.prepareStatement("insert into test(id) values(next value for test_seq)");
                        PreparedStatement prep2 = conn.prepareStatement("delete from test");
                        while (!stop) {
                            prep.execute();
                            if (Math.random() < 0.01) {
                                prep2.execute();
                            }
                            if (Math.random() < 0.01) {
                                createDropTrigger(conn);
                            }
                        }
                    }
                }

                private void createDropTrigger(Connection conn) throws Exception {
                    String triggerName = "t_" + x;
                    Statement stat = conn.createStatement();
                    stat.execute("create trigger " + triggerName + " before insert on dummy call \"" + TriggerTest.class.getName() + "\"");
                    stat.execute("drop trigger " + triggerName);
                }
            }.execute();
        }
        Thread.sleep(1000);
        for (Task t : tasks) {
            t.get();
        }
    } finally {
        for (Task t : tasks) {
            t.join();
        }
        conn.close();
    }
}

Example 39 with Task

use of org.h2.util.Task in project h2database by h2database.

the class TestMultiThread method testConcurrentLobAdd.

private void testConcurrentLobAdd() throws Exception {
    String db = getTestName();
    deleteDb(db);
    final String url = getURL(db + ";MULTI_THREADED=1", true);
    try (Connection conn = getConnection(url)) {
        Statement stat = conn.createStatement();
        stat.execute("create table test(id identity, data clob)");
        Task[] tasks = new Task[2];
        for (int i = 0; i < tasks.length; i++) {
            Task t = new Task() {

                @Override
                public void call() throws Exception {
                    try (Connection c2 = getConnection(url)) {
                        PreparedStatement p2 = c2.prepareStatement("insert into test(data) values(?)");
                        while (!stop) {
                            p2.setCharacterStream(1, new StringReader(new String(new char[10 * 1024])));
                            p2.execute();
                        }
                    }
                }
            };
            tasks[i] = t;
            t.execute();
        }
        Thread.sleep(500);
        for (Task t : tasks) {
            t.get();
        }
    }
}

Example 40 with Task

use of org.h2.util.Task in project h2database by h2database.

the class TestMultiThread method testConcurrentAlter.

private void testConcurrentAlter() throws Exception {
    deleteDb(getTestName());
    try (final Connection conn = getConnection(getTestName())) {
        Statement stat = conn.createStatement();
        Task t = new Task() {

            @Override
            public void call() throws Exception {
                while (!stop) {
                    conn.prepareStatement("select * from test");
                }
            }
        };
        stat.execute("create table test(id int)");
        t.execute();
        for (int i = 0; i < 200; i++) {
            stat.execute("alter table test add column x int");
            stat.execute("alter table test drop column x");
        }
        t.get();
    }
}