Class MetadataUtils.HeaderAttachingClientInterceptor

java.lang.Object

io.grpc.stub.MetadataUtils.HeaderAttachingClientInterceptor

All Implemented Interfaces:

ClientInterceptor

Enclosing class:

MetadataUtils

private static final class MetadataUtils.HeaderAttachingClientInterceptor
extends Object
implements ClientInterceptor

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private final class	MetadataUtils.HeaderAttachingClientInterceptor.HeaderAttachingClientCall<ReqT,RespT>

Field Summary

Fields

Modifier and Type	Field	Description
private final Metadata	extraHeaders

Constructor Summary

Constructors

Constructor	Description
HeaderAttachingClientInterceptor(Metadata extraHeaders)

Method Summary

Modifier and Type	Method	Description
<ReqT,RespT> ClientCall<ReqT,RespT>	interceptCall(MethodDescriptor<ReqT,RespT> method, CallOptions callOptions, Channel next)	Intercept ClientCall creation by the next Channel.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

extraHeaders

private final Metadata extraHeaders

Constructor Details

HeaderAttachingClientInterceptor

HeaderAttachingClientInterceptor(Metadata extraHeaders)

Method Details

interceptCall

public <ReqT,RespT> ClientCall<ReqT,RespT> interceptCall(MethodDescriptor<ReqT,RespT> method,
 CallOptions callOptions,
 Channel next)

Description copied from interface: ClientInterceptor

Intercept ClientCall creation by the next Channel.

Many variations of interception are possible. Complex implementations may return a wrapper around the result of next.newCall(), whereas a simpler implementation may just modify the header metadata prior to returning the result of next.newCall().

next.newCall() must not be called under a different Context other than the current Context. The outcome of such usage is undefined and may cause memory leak due to unbounded chain of Contexts.

Specified by:

interceptCall in interface ClientInterceptor

Parameters:

method - the remote method to be called.

callOptions - the runtime options to be applied to this call.

next - the channel which is being intercepted.

Returns:

the call object for the remote operation, never null.