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Example 1 with TransactionRequest

use of com.google.apphosting.utils.remoteapi.RemoteApiPb.TransactionRequest in project appengine-java-standard by GoogleCloudPlatform.

the class RemoteApiServlet method executeTx.

private byte[] executeTx(Request request) {
    TransactionRequest txRequest = new TransactionRequest();
    parseFromBytes(txRequest, request.getRequestAsBytes());
    byte[] tx = beginTransaction(txRequest.isAllowMultipleEg());
    List<Precondition> preconditions = txRequest.preconditions();
    // Check transaction preconditions
    if (!preconditions.isEmpty()) {
        GetRequest getRequest = new GetRequest();
        for (Precondition precondition : preconditions) {
            OnestoreEntity.Reference key = precondition.getKey();
            OnestoreEntity.Reference requestKey = getRequest.addKey();
            requestKey.mergeFrom(key);
        }
        GetResponse getResponse = txGet(tx, getRequest);
        List<GetResponse.Entity> entities = getResponse.entitys();
        // TODO: Consider supporting deferred gets here.
        assert (entities.size() == preconditions.size());
        for (int i = 0; i < entities.size(); i++) {
            // Throw an exception if any of the Entities don't match the Precondition specification.
            assertEntityResultMatchesPrecondition(entities.get(i), preconditions.get(i));
        }
    }
    // Preconditions OK.
    // Perform puts.
    // a serialized VoidProto
    byte[] res = new byte[0];
    if (txRequest.hasPuts()) {
        PutRequest putRequest = txRequest.getPuts();
        parseFromBytes(putRequest.getMutableTransaction(), tx);
        res = ApiProxy.makeSyncCall("datastore_v3", "Put", putRequest.toByteArray());
    }
    // Perform deletes.
    if (txRequest.hasDeletes()) {
        DeleteRequest deleteRequest = txRequest.getDeletes();
        parseFromBytes(deleteRequest.getMutableTransaction(), tx);
        ApiProxy.makeSyncCall("datastore_v3", "Delete", deleteRequest.toByteArray());
    }
    // Commit transaction.
    ApiProxy.makeSyncCall("datastore_v3", "Commit", tx);
    return res;
}
Also used : OnestoreEntity(com.google.storage.onestore.v3.OnestoreEntity) Precondition(com.google.apphosting.utils.remoteapi.RemoteApiPb.TransactionRequest.Precondition) PutRequest(com.google.apphosting.datastore.DatastoreV3Pb.PutRequest) GetResponse(com.google.apphosting.datastore.DatastoreV3Pb.GetResponse) BeginTransactionRequest(com.google.apphosting.datastore.DatastoreV3Pb.BeginTransactionRequest) TransactionRequest(com.google.apphosting.utils.remoteapi.RemoteApiPb.TransactionRequest) GetRequest(com.google.apphosting.datastore.DatastoreV3Pb.GetRequest) OnestoreEntity(com.google.storage.onestore.v3.OnestoreEntity) DeleteRequest(com.google.apphosting.datastore.DatastoreV3Pb.DeleteRequest)

Aggregations

BeginTransactionRequest (com.google.apphosting.datastore.DatastoreV3Pb.BeginTransactionRequest)1 DeleteRequest (com.google.apphosting.datastore.DatastoreV3Pb.DeleteRequest)1 GetRequest (com.google.apphosting.datastore.DatastoreV3Pb.GetRequest)1 GetResponse (com.google.apphosting.datastore.DatastoreV3Pb.GetResponse)1 PutRequest (com.google.apphosting.datastore.DatastoreV3Pb.PutRequest)1 TransactionRequest (com.google.apphosting.utils.remoteapi.RemoteApiPb.TransactionRequest)1 Precondition (com.google.apphosting.utils.remoteapi.RemoteApiPb.TransactionRequest.Precondition)1 OnestoreEntity (com.google.storage.onestore.v3.OnestoreEntity)1