Package io.grpc.stub
Class MetadataUtils.HeaderAttachingClientInterceptor
- java.lang.Object
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- io.grpc.stub.MetadataUtils.HeaderAttachingClientInterceptor
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- All Implemented Interfaces:
ClientInterceptor
- Enclosing class:
- MetadataUtils
private static final class MetadataUtils.HeaderAttachingClientInterceptor extends java.lang.Object implements ClientInterceptor
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Nested Class Summary
Nested Classes Modifier and Type Class Description private class
MetadataUtils.HeaderAttachingClientInterceptor.HeaderAttachingClientCall<ReqT,RespT>
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Field Summary
Fields Modifier and Type Field Description private Metadata
extraHeaders
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Constructor Summary
Constructors Constructor Description HeaderAttachingClientInterceptor(Metadata extraHeaders)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <ReqT,RespT>
ClientCall<ReqT,RespT>interceptCall(MethodDescriptor<ReqT,RespT> method, CallOptions callOptions, Channel next)
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Field Detail
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extraHeaders
private final Metadata extraHeaders
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Constructor Detail
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HeaderAttachingClientInterceptor
HeaderAttachingClientInterceptor(Metadata extraHeaders)
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Method Detail
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interceptCall
public <ReqT,RespT> ClientCall<ReqT,RespT> interceptCall(MethodDescriptor<ReqT,RespT> method, CallOptions callOptions, Channel next)
Description copied from interface:ClientInterceptor
InterceptClientCall
creation by thenext
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 ofnext.newCall()
.next.newCall()
must not be called under a differentContext
other than the currentContext
. The outcome of such usage is undefined and may cause memory leak due to unbounded chain ofContext
s.- Specified by:
interceptCall
in interfaceClientInterceptor
- 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
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