grpc/include/grpc++/resource_quota.h

/*
 *
 * Copyright 2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef GRPCXX_RESOURCE_QUOTA_H
#define GRPCXX_RESOURCE_QUOTA_H

struct grpc_resource_quota;

#include <grpc++/impl/codegen/config.h>
#include <grpc++/impl/codegen/grpc_library.h>

namespace grpc {

/// ResourceQuota represents a bound on memory usage by the gRPC library.
/// A ResourceQuota can be attached to a server (via \a ServerBuilder),
/// or a client channel (via \a ChannelArguments).
/// gRPC will attempt to keep memory used by all attached entities
/// below the ResourceQuota bound.
class ResourceQuota final : private GrpcLibraryCodegen {
 public:
  /// \param name - a unique name for this ResourceQuota.
  explicit ResourceQuota(const grpc::string& name);
  ResourceQuota();
  ~ResourceQuota();

  /// Resize this \a ResourceQuota to a new size. If \a new_size is smaller
  /// than the current size of the pool, memory usage will be monotonically
  /// decreased until it falls under \a new_size.
  /// No time bound is given for this to occur however.
  ResourceQuota& Resize(size_t new_size);

  grpc_resource_quota* c_resource_quota() const { return impl_; }

 private:
  ResourceQuota(const ResourceQuota& rhs);
  ResourceQuota& operator=(const ResourceQuota& rhs);

  grpc_resource_quota* const impl_;
};

}  // namespace grpc

#endif  // GRPCXX_RESOURCE_QUOTA_H