Examples with ThriftTransportPool org.apache.accumulo.core.clientImpl.ThriftTransportPool used on opensource projects

Example 1 with ThriftTransportPool

use of org.apache.accumulo.core.clientImpl.ThriftTransportPool in project accumulo by apache.

the class TransportCachingIT method testCachedTransport.

@Test
public void testCachedTransport() throws InterruptedException {
    try (AccumuloClient client = Accumulo.newClient().from(getClientProps()).build()) {
        List<String> tservers;
        while ((tservers = client.instanceOperations().getTabletServers()).isEmpty()) {
            // sleep until a tablet server is up
            Thread.sleep(50);
        }
        ClientContext context = (ClientContext) client;
        long rpcTimeout = ConfigurationTypeHelper.getTimeInMillis(Property.GENERAL_RPC_TIMEOUT.getDefaultValue());
        List<ThriftTransportKey> servers = tservers.stream().map(serverStr -> {
            return new ThriftTransportKey(HostAndPort.fromString(serverStr), rpcTimeout, context);
        }).collect(Collectors.toList());
        // only want to use one server for all subsequent test
        servers = servers.subList(0, 1);
        ThriftTransportPool pool = context.getTransportPool();
        TTransport first = getAnyTransport(servers, pool, true);
        assertNotNull(first);
        // Return it to unreserve it
        pool.returnTransport(first);
        TTransport second = getAnyTransport(servers, pool, true);
        // We should get the same transport
        assertSame("Expected the first and second to be the same instance", first, second);
        pool.returnTransport(second);
        // Ensure does not get cached connection just returned
        TTransport third = getAnyTransport(servers, pool, false);
        assertNotSame("Expected second and third transport to be different instances", second, third);
        TTransport fourth = getAnyTransport(servers, pool, false);
        assertNotSame("Expected third and fourth transport to be different instances", third, fourth);
        pool.returnTransport(third);
        pool.returnTransport(fourth);
        // The following three asserts ensure the per server queue is LIFO
        TTransport fifth = getAnyTransport(servers, pool, true);
        assertSame("Expected fourth and fifth transport to be the same instance", fourth, fifth);
        TTransport sixth = getAnyTransport(servers, pool, true);
        assertSame("Expected third and sixth transport to be the same instance", third, sixth);
        TTransport seventh = getAnyTransport(servers, pool, true);
        assertSame("Expected second and seventh transport to be the same instance", second, seventh);
        pool.returnTransport(fifth);
        pool.returnTransport(sixth);
        pool.returnTransport(seventh);
    }
}