java/dagger/grpc/server/GrpcCallMetadataModule.java

/*
 * Copyright (C) 2016 The Dagger Authors.
 *
 * 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.
 */

package dagger.grpc.server;

import static com.google.common.base.Preconditions.checkNotNull;

import dagger.Module;
import dagger.Provides;
import io.grpc.Metadata;

/**
 * Provides {@link Metadata} about a gRPC call.
 */
@Module
public final class GrpcCallMetadataModule {
  private final Metadata metadata;

  public GrpcCallMetadataModule(Metadata metadata) {
    this.metadata = checkNotNull(metadata);
  }

  @Provides
  Metadata provideHeaders() {
    return metadata;
  }
}