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ForceTrailersServerInterceptor.java
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ForceTrailersServerInterceptor.java
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/*
* Copyright 2023 The gRPC 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 io.grpc.servlet;
import io.grpc.ForwardingServerCall;
import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import io.grpc.Status;
class ForceTrailersServerInterceptor implements ServerInterceptor {
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
ServerCall<ReqT, RespT> call,
Metadata headers,
ServerCallHandler<ReqT, RespT> next) {
ServerCall<ReqT, RespT> interceptedCall =
new ForwardingServerCall.SimpleForwardingServerCall<ReqT, RespT>(call) {
private boolean headersSent = false;
@Override
public void sendHeaders(Metadata headers) {
super.sendHeaders(headers);
headersSent = true;
}
@Override
public void close(Status status, Metadata trailers) {
if (!headersSent) {
sendHeaders(new Metadata());
}
super.close(status, trailers);
}
};
return next.startCall(interceptedCall, headers);
}
}