Class GrpcCallContext (2.9.0)

public final class GrpcCallContext implements ApiCallContext

GrpcCallContext encapsulates context data used to make a grpc call.

GrpcCallContext is immutable in the sense that none of its methods modifies the GrpcCallContext itself or the underlying data. Methods of the form withX, such as #withTransportChannel, return copies of the object, but with one field changed. The immutability and thread safety of the arguments solely depends on the arguments themselves.

Inheritance

Object > GrpcCallContext

Implements

ApiCallContext

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Methods

<T>getOption(ApiCallContext.Key<T> key)

public T <T>getOption(ApiCallContext.Key<T> key)

Return the api call context option set for this context.

Parameter

Name	Description
key	`Key<T>`

Returns

Type	Description
T

<T>withOption(ApiCallContext.Key<T> key, T value)

public GrpcCallContext <T>withOption(ApiCallContext.Key<T> key, T value)

Return a new ApiCallContext with additional option merged into the present instance. Any existing value of the key is overwritten.

Parameters

Name	Description
key	`Key<T>`
value	`T`

Returns

Type	Description
GrpcCallContext

createDefault()

public static GrpcCallContext createDefault()

Returns an empty instance with a null channel and default CallOptions.

Returns

Type	Description
GrpcCallContext

equals(Object o)

public boolean equals(Object o)

Parameter

Name	Description
o	`Object`

Returns

Type	Description
boolean

Overrides

Object.equals(Object)

getCallOptions()

public CallOptions getCallOptions()

The CallOptions set on this context.

Returns

Type	Description
io.grpc.CallOptions

getChannel()

public Channel getChannel()

The Channel set on this context.

Returns

Type	Description
io.grpc.Channel

getChannelAffinity()

public Integer getChannelAffinity()

The channel affinity for this context.

Returns

Type	Description
Integer

getExtraHeaders()

public Map<String,List<String>> getExtraHeaders()

The extra header for this context.

Returns

Type	Description
Map<String,List<String>>

getRetrySettings()

public RetrySettings getRetrySettings()

Returns the RetrySettings to use with this context, or null if the default RetrySettings should be used.

Returns

Type	Description
RetrySettings

getRetryableCodes()

public Set<StatusCode.Code> getRetryableCodes()

Returns the retryable codes to use with this context, or null if the default retryable codes should be used.

Returns

Type	Description
Set<Code>

getStreamIdleTimeout()

public Duration getStreamIdleTimeout()

The stream idle timeout set for this context.

Returns

Type	Description
org.threeten.bp.Duration

getStreamWaitTimeout()

public Duration getStreamWaitTimeout()

The stream wait timeout set for this context.

Returns

Type	Description
org.threeten.bp.Duration

getTimeout()

public Duration getTimeout()

Returns the configured per-RPC timeout.

Returns

Type	Description
org.threeten.bp.Duration

getTracer()

public ApiTracer getTracer()

The ApiTracer that was previously set for this context.

The ApiTracer will be used to trace the current operation and to annotate various events like retries.

Returns

Type	Description
ApiTracer

hashCode()

public int hashCode()

Returns

Type	Description
int

Overrides

Object.hashCode()

merge(ApiCallContext inputCallContext)

public ApiCallContext merge(ApiCallContext inputCallContext)

For any values in inputCallContext that are not null, override the corresponding values in the present instance.

Parameter

Name	Description
inputCallContext	`ApiCallContext`

Returns

Type	Description
ApiCallContext

nullToSelf(ApiCallContext inputContext)

public GrpcCallContext nullToSelf(ApiCallContext inputContext)

Returns inputContext cast to GrpcCallContext, or an empty GrpcCallContext if inputContext is null.

Parameter

Name	Description
inputContext	`ApiCallContext` the ApiCallContext to cast if it is not null

Returns

Type	Description
GrpcCallContext

of(Channel channel, CallOptions callOptions)

public static GrpcCallContext of(Channel channel, CallOptions callOptions)

Returns an instance with the given channel and CallOptions.

Parameters

Name	Description
channel	`io.grpc.Channel`
callOptions	`io.grpc.CallOptions`

Returns

Type	Description
GrpcCallContext

withCallOptions(CallOptions newCallOptions)

public GrpcCallContext withCallOptions(CallOptions newCallOptions)

Returns a new instance with the call options set to the given call options.

Parameter

Name	Description
newCallOptions	`io.grpc.CallOptions`

Returns

Type	Description
GrpcCallContext

withChannel(Channel newChannel)

public GrpcCallContext withChannel(Channel newChannel)

Returns a new instance with the channel set to the given channel.

Parameter

Name	Description
newChannel	`io.grpc.Channel`

Returns

Type	Description
GrpcCallContext

withChannelAffinity(Integer affinity)

public GrpcCallContext withChannelAffinity(Integer affinity)

Parameter

Name	Description
affinity	`Integer`

Returns

Type	Description
GrpcCallContext

withCredentials(Credentials newCredentials)

public GrpcCallContext withCredentials(Credentials newCredentials)

Returns a new ApiCallContext with the given credentials set.

Parameter

Name	Description
newCredentials	`com.google.auth.Credentials`

Returns

Type	Description
GrpcCallContext

withExtraHeaders(Map<String,List<String>> extraHeaders)

public GrpcCallContext withExtraHeaders(Map<String,List<String>> extraHeaders)

Return a new ApiCallContext with the extraHeaders merged into the present instance.

Parameter

Name	Description
extraHeaders	`Map<String,List<String>>`

Returns

Type	Description
GrpcCallContext

withRequestParamsDynamicHeaderOption(String requestParams)

public GrpcCallContext withRequestParamsDynamicHeaderOption(String requestParams)

Parameter

Name	Description
requestParams	`String`

Returns

Type	Description
GrpcCallContext

withRetrySettings(RetrySettings retrySettings)

public GrpcCallContext withRetrySettings(RetrySettings retrySettings)

Returns a new ApiCallContext with the given RetrySettings set.

This sets the RetrySettings to use for the RPC. These settings will work in combination with either the default retryable codes for the RPC, or the retryable codes supplied through #withRetryableCodes(Set). Calling #withRetrySettings(RetrySettings) on an RPC that does not include Code#DEADLINE_EXCEEDED as one of its retryable codes (or without calling #withRetryableCodes(Set) with a set that includes at least Code#DEADLINE_EXCEEDED) will effectively only set a single timeout that is equal to RetrySettings#getInitialRpcTimeout(). If this timeout is exceeded, the RPC will not be retried and will fail with Code#DEADLINE_EXCEEDED.

Example usage:


 ApiCallContext context = GrpcCallContext.createDefault()
   .withRetrySettings(RetrySettings.newBuilder()
     .setInitialRetryDelay(Duration.ofMillis(10L))
     .setInitialRpcTimeout(Duration.ofMillis(100L))
     .setMaxAttempts(10)
     .setMaxRetryDelay(Duration.ofSeconds(10L))
     .setMaxRpcTimeout(Duration.ofSeconds(30L))
     .setRetryDelayMultiplier(1.4)
     .setRpcTimeoutMultiplier(1.5)
     .setTotalTimeout(Duration.ofMinutes(10L))
     .build())
   .withRetryableCodes(Sets.newSet(
     StatusCode.Code.UNAVAILABLE,
     StatusCode.Code.DEADLINE_EXCEEDED));

Setting a logical call timeout for the context can be done similarly with RetrySettings.Builder#setLogicalTimeout(Duration timeout).

Example usage:


 ApiCallContext context = GrpcCallContext.createDefault()
   .withRetrySettings(RetrySettings.newBuilder()
     .setInitialRetryDelay(Duration.ofMillis(10L))
     .setMaxRetryDelay(Duration.ofSeconds(10L))
     .setRetryDelayMultiplier(1.4)
     .setMaxAttempts(10)
     .setLogicalTimeout(Duration.ofSeconds(30L))
     .build());

Parameter

Name	Description
retrySettings	`RetrySettings`

Returns

Type	Description
GrpcCallContext

withRetryableCodes(Set<StatusCode.Code> retryableCodes)

public GrpcCallContext withRetryableCodes(Set<StatusCode.Code> retryableCodes)

Returns a new ApiCallContext with the given retryable codes set.

This sets the retryable codes to use for the RPC. These settings will work in combination with either the default RetrySettings for the RPC, or the RetrySettings supplied through #withRetrySettings(RetrySettings).

Setting a non-empty set of retryable codes for an RPC that is not already retryable by default, will not have any effect and the RPC will NOT be retried. This option can only be used to change which codes are considered retryable for an RPC that already has at least one retryable code in its default settings.

Parameter

Name	Description
retryableCodes	`Set<Code>`

Returns

Type	Description
GrpcCallContext

withStreamIdleTimeout(Duration streamIdleTimeout)

public GrpcCallContext withStreamIdleTimeout(Duration streamIdleTimeout)

Returns a new ApiCallContext with the given stream idle timeout set.

This timeout only applies to a ServerStreamingCallables. It limits the maximum amount of timeout that can pass between a message being received by ResponseObserver#onResponse(Object) and demand being signaled via StreamController#request(int). Please note that this timeout is best effort and the maximum resolution configured in StubSettings#getStreamWatchdogCheckInterval(). This is useful to clean up streams that were partially read but never closed. When the timeout has been reached, the stream will be closed with a nonretryable WatchdogTimeoutException and a status of StatusCode.Code#ABORTED.

A value of Duration#ZERO, disables the streaming idle timeout and a null value will use the default in the callable.

Please note that this timeout is best effort and the maximum resolution is configured in StubSettings#getStreamWatchdogCheckInterval().

Parameter

Name	Description
streamIdleTimeout	`org.threeten.bp.Duration`

Returns

Type	Description
GrpcCallContext

withStreamWaitTimeout(Duration streamWaitTimeout)

public GrpcCallContext withStreamWaitTimeout(Duration streamWaitTimeout)

Returns a new ApiCallContext with the given stream timeout set.

This timeout only applies to a ServerStreamingCallables. It limits the maximum amount of time that can pass between demand being signaled via StreamController#request(int) and actual message delivery to ResponseObserver#onResponse(Object). Or, in the case of automatic flow control, since the last message was delivered to ResponseObserver#onResponse(Object). This is useful to detect server or connection stalls. When the timeout has been reached, the stream will be closed with a retryable WatchdogTimeoutException and a status of StatusCode.Code#ABORTED.

A value of Duration#ZERO, disables the streaming wait timeout and a null value will use the default in the callable.

Please note that this timeout is best effort and the maximum resolution is configured in StubSettings#getStreamWatchdogCheckInterval().

Parameter

Name	Description
streamWaitTimeout	`org.threeten.bp.Duration`

Returns

Type	Description
GrpcCallContext

withTimeout(Duration timeout)

public GrpcCallContext withTimeout(Duration timeout)

Returns a new ApiCallContext with the given timeout set.

This sets the maximum amount of time a single unary RPC attempt can take. If retries are enabled, then this can take much longer, as each RPC attempt will have the same constant timeout. Unlike a deadline, timeouts are relative durations that are measure from the beginning of each RPC attempt. Please note that this limits the duration of a server streaming RPC as well.

If a method has default com.google.api.gax.retrying.RetrySettings, the max attempts and/or total timeout is still respected when scheduling each RPC attempt.

Parameter

Name	Description
timeout	`org.threeten.bp.Duration`

Returns

Type	Description
GrpcCallContext

withTracer(ApiTracer tracer)

public GrpcCallContext withTracer(ApiTracer tracer)

Returns a new ApiCallContext with the given ApiTracer.

The ApiTracer will be used to trace the current operation and to annotate various events like retries.

Parameter

Name	Description
tracer	`ApiTracer`

Returns

Type	Description
GrpcCallContext

withTransportChannel(TransportChannel inputChannel)

public GrpcCallContext withTransportChannel(TransportChannel inputChannel)

Returns a new ApiCallContext with the given channel set.

Parameter

Name	Description
inputChannel	`TransportChannel`

Returns

Type	Description
GrpcCallContext