jni-thrift-util.h

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// Copyright 2015 Cloudera Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef IMPALA_RPC_JNI_THRIFT_UTIL_H
#define IMPALA_RPC_JNI_THRIFT_UTIL_H

#include "rpc/thrift-util.h"
#include "util/jni-util.h"


namespace impala {

template <class T>
Status SerializeThriftMsg(JNIEnv* env, T* msg, jbyteArray* serialized_msg) {
  int buffer_size = 100 * 1024;  // start out with 100KB
  ThriftSerializer serializer(false, buffer_size);

  uint8_t* buffer = NULL;
  uint32_t size = 0;
  RETURN_IF_ERROR(serializer.Serialize<T>(msg, &size, &buffer));

  *serialized_msg = env->NewByteArray(size);
  RETURN_ERROR_IF_EXC(env);
  if (*serialized_msg == NULL) return Status("couldn't construct jbyteArray");
  env->SetByteArrayRegion(*serialized_msg, 0, size, reinterpret_cast<jbyte*>(buffer));
  RETURN_ERROR_IF_EXC(env);
  return Status::OK;
}

template <class T>
Status DeserializeThriftMsg(JNIEnv* env, jbyteArray serialized_msg, T* deserialized_msg) {
  jboolean is_copy = false;
  uint32_t buf_size = env->GetArrayLength(serialized_msg);
  jbyte* buf = env->GetByteArrayElements(serialized_msg, &is_copy);

  RETURN_IF_ERROR(DeserializeThriftMsg(
          reinterpret_cast<uint8_t*>(buf), &buf_size, false, deserialized_msg));

  env->ReleaseByteArrayElements(serialized_msg, buf, JNI_ABORT);
  return Status::OK;
}

}

#endif