Examples with Txn com.coreos.jetcd.op.Txn used on opensource projects

Example 1 with Txn

use of com.coreos.jetcd.op.Txn in project jetcd by coreos.

the class KVTest method testTxn.

@Test
public void testTxn() throws Exception {
    ByteString sampleKey = ByteString.copyFrom("txn_key", "UTF-8");
    ByteString sampleValue = ByteString.copyFrom("xyz", "UTF-8");
    ByteString cmpValue = ByteString.copyFrom("abc", "UTF-8");
    ByteString putValue = ByteString.copyFrom("XYZ", "UTF-8");
    ByteString putValueNew = ByteString.copyFrom("ABC", "UTF-8");
    ListenableFuture<PutResponse> feature = kvClient.put(sampleKey, sampleValue);
    try {
        // put the original txn key value pair
        PutResponse putResp = feature.get();
        // construct txn operation
        Cmp cmp = new Cmp(sampleKey, Cmp.Op.GREATER, CmpTarget.value(cmpValue));
        Txn txn = Txn.newBuilder().If(cmp).Then(Op.put(sampleKey, putValue, PutOption.DEFAULT)).Else(Op.put(sampleKey, putValueNew, PutOption.DEFAULT)).build();
        ListenableFuture<TxnResponse> txnResp = kvClient.commit(txn);
        txnResp.get();
        // get the value
        RangeResponse getResp = kvClient.get(sampleKey).get();
        test.assertEquals(getResp.getKvsList().size(), 1);
        test.assertEquals(getResp.getKvs(0).getValue().toStringUtf8(), "XYZ");
    } catch (Exception e) {
    // empty
    }
}