Class RoutingRule (2.34.0)

public final class RoutingRule extends GeneratedMessageV3 implements RoutingRuleOrBuilder

Specifies the routing information that should be sent along with the request in the form of routing header. NOTE: All service configuration rules follow the "last one wins" order.

The examples below will apply to an RPC which has the following request type:

Message Definition:

 message Request {
   // The name of the Table
   // Values can be of the following formats:
   // - <code>projects/&lt;project&gt;/tables/&lt;table&gt;</code>
   // - <code>projects/&lt;project&gt;/instances/&lt;instance&gt;/tables/&lt;table&gt;</code>
   // - <code>region/&lt;region&gt;/zones/&lt;zone&gt;/tables/&lt;table&gt;</code>
   string table_name = 1;

   // This value specifies routing for replication.
   // It can be in the following formats:
   // - <code>profiles/&lt;profile_id&gt;</code>
   // - a legacy <code>profile_id</code> that can be any string
   string app_profile_id = 2;
 }

Example message:

 {
   table_name: projects/proj_foo/instances/instance_bar/table/table_baz,
   app_profile_id: profiles/prof_qux
 }

The routing header consists of one or multiple key-value pairs. Every key and value must be percent-encoded, and joined together in the format of key1=value1&key2=value2. In the examples below I am skipping the percent-encoding for readablity.

Example 1

Extracting a field from the request to put into the routing header unchanged, with the key equal to the field name.

annotation:

 option (google.api.routing) = {
   // Take the <code>app_profile_id</code>.
   routing_parameters {
     field: "app_profile_id"
   }
 };

result:

 x-goog-request-params: app_profile_id=profiles/prof_qux

Example 2

Extracting a field from the request to put into the routing header unchanged, with the key different from the field name.

annotation:

 option (google.api.routing) = {
   // Take the <code>app_profile_id</code>, but name it <code>routing_id</code> in the header.
   routing_parameters {
     field: "app_profile_id"
     path_template: "{routing_id=**}"
   }
 };

result:

 x-goog-request-params: routing_id=profiles/prof_qux

Example 3

Extracting a field from the request to put into the routing header, while matching a path template syntax on the field's value.

NB: it is more useful to send nothing than to send garbage for the purpose of dynamic routing, since garbage pollutes cache. Thus the matching.

Sub-example 3a

The field matches the template.

annotation:

 option (google.api.routing) = {
   // Take the <code>table_name</code>, if it's well-formed (with project-based
   // syntax).
   routing_parameters {
     field: "table_name"
     path_template: "{table_name=projects/&#42;&#47;instances/&#42;&#47;&#42;*}"
   }
 };

result:

 x-goog-request-params:
 table_name=projects/proj_foo/instances/instance_bar/table/table_baz

Sub-example 3b

The field does not match the template.

annotation:

 option (google.api.routing) = {
   // Take the <code>table_name</code>, if it's well-formed (with region-based
   // syntax).
   routing_parameters {
     field: "table_name"
     path_template: "{table_name=regions/&#42;&#47;zones/&#42;&#47;&#42;*}"
   }
 };

result:

 &lt;no routing header will be sent&gt;

Sub-example 3c

Multiple alternative conflictingly named path templates are specified. The one that matches is used to construct the header.

annotation:

 option (google.api.routing) = {
   // Take the <code>table_name</code>, if it's well-formed, whether
   // using the region- or projects-based syntax.

   routing_parameters {
     field: "table_name"
     path_template: "{table_name=regions/&#42;&#47;zones/&#42;&#47;&#42;*}"
   }
   routing_parameters {
     field: "table_name"
     path_template: "{table_name=projects/&#42;&#47;instances/&#42;&#47;&#42;*}"
   }
 };

result:

 x-goog-request-params:
 table_name=projects/proj_foo/instances/instance_bar/table/table_baz

Example 4

Extracting a single routing header key-value pair by matching a template syntax on (a part of) a single request field.

annotation:

 option (google.api.routing) = {
   // Take just the project id from the <code>table_name</code> field.
   routing_parameters {
     field: "table_name"
     path_template: "{routing_id=projects/&#42;}/&#42;*"
   }
 };

result:

 x-goog-request-params: routing_id=projects/proj_foo

Example 5

Extracting a single routing header key-value pair by matching several conflictingly named path templates on (parts of) a single request field. The last template to match "wins" the conflict.

annotation:

 option (google.api.routing) = {
   // If the <code>table_name</code> does not have instances information,
   // take just the project id for routing.
   // Otherwise take project + instance.

   routing_parameters {
     field: "table_name"
     path_template: "{routing_id=projects/&#42;}/&#42;*"
   }
   routing_parameters {
     field: "table_name"
     path_template: "{routing_id=projects/&#42;&#47;instances/&#42;}/&#42;*"
   }
 };

result:

 x-goog-request-params:
 routing_id=projects/proj_foo/instances/instance_bar

Example 6

Extracting multiple routing header key-value pairs by matching several non-conflicting path templates on (parts of) a single request field.

Sub-example 6a

Make the templates strict, so that if the table_name does not have an instance information, nothing is sent.

annotation:

 option (google.api.routing) = {
   // The routing code needs two keys instead of one composite
   // but works only for the tables with the "project-instance" name
   // syntax.

   routing_parameters {
     field: "table_name"
     path_template: "{project_id=projects/&#42;}/instances/&#42;&#47;&#42;*"
   }
   routing_parameters {
     field: "table_name"
     path_template: "projects/&#42;&#47;{instance_id=instances/&#42;}/&#42;*"
   }
 };

result:

 x-goog-request-params:
 project_id=projects/proj_foo&amp;instance_id=instances/instance_bar

Sub-example 6b

Make the templates loose, so that if the table_name does not have an instance information, just the project id part is sent.

annotation:

 option (google.api.routing) = {
   // The routing code wants two keys instead of one composite
   // but will work with just the <code>project_id</code> for tables without
   // an instance in the <code>table_name</code>.

   routing_parameters {
     field: "table_name"
     path_template: "{project_id=projects/&#42;}/&#42;*"
   }
   routing_parameters {
     field: "table_name"
     path_template: "projects/&#42;&#47;{instance_id=instances/&#42;}/&#42;*"
   }
 };

result (is the same as 6a for our example message because it has the instance information):

 x-goog-request-params:
 project_id=projects/proj_foo&amp;instance_id=instances/instance_bar

Example 7

Extracting multiple routing header key-value pairs by matching several path templates on multiple request fields.

NB: note that here there is no way to specify sending nothing if one of the fields does not match its template. E.g. if the table_name is in the wrong format, the project_id will not be sent, but the routing_id will be. The backend routing code has to be aware of that and be prepared to not receive a full complement of keys if it expects multiple.

annotation:

 option (google.api.routing) = {
   // The routing needs both <code>project_id</code> and <code>routing_id</code>
   // (from the <code>app_profile_id</code> field) for routing.

   routing_parameters {
     field: "table_name"
     path_template: "{project_id=projects/&#42;}/&#42;*"
   }
   routing_parameters {
     field: "app_profile_id"
     path_template: "{routing_id=**}"
   }
 };

result:

 x-goog-request-params:
 project_id=projects/proj_foo&amp;routing_id=profiles/prof_qux

Example 8

Extracting a single routing header key-value pair by matching several conflictingly named path templates on several request fields. The last template to match "wins" the conflict.

annotation:

 option (google.api.routing) = {
   // The <code>routing_id</code> can be a project id or a region id depending on
   // the table name format, but only if the <code>app_profile_id</code> is not set.
   // If <code>app_profile_id</code> is set it should be used instead.

   routing_parameters {
     field: "table_name"
     path_template: "{routing_id=projects/&#42;}/&#42;*"
   }
   routing_parameters {
      field: "table_name"
      path_template: "{routing_id=regions/&#42;}/&#42;*"
   }
   routing_parameters {
     field: "app_profile_id"
     path_template: "{routing_id=**}"
   }
 };

result:

 x-goog-request-params: routing_id=profiles/prof_qux

Example 9

Bringing it all together.

annotation:

 option (google.api.routing) = {
   // For routing both <code>table_location</code> and a <code>routing_id</code> are needed.
   //
   // table_location can be either an instance id or a region+zone id.
   //
   // For <code>routing_id</code>, take the value of <code>app_profile_id</code>
   // - If it's in the format <code>profiles/&lt;profile_id&gt;</code>, send
   // just the <code>&lt;profile_id&gt;</code> part.
   // - If it's any other literal, send it as is.
   // If the <code>app_profile_id</code> is empty, and the <code>table_name</code> starts with
   // the project_id, send that instead.

   routing_parameters {
     field: "table_name"
     path_template: "projects/&#42;&#47;{table_location=instances/&#42;}/tables/&#42;"
   }
   routing_parameters {
     field: "table_name"
     path_template: "{table_location=regions/&#42;&#47;zones/&#42;}/tables/&#42;"
   }
   routing_parameters {
     field: "table_name"
     path_template: "{routing_id=projects/&#42;}/&#42;*"
   }
   routing_parameters {
     field: "app_profile_id"
     path_template: "{routing_id=**}"
   }
   routing_parameters {
     field: "app_profile_id"
     path_template: "profiles/{routing_id=*}"
   }
 };

result:

 x-goog-request-params:
 table_location=instances/instance_bar&amp;routing_id=prof_qux

Protobuf type google.api.RoutingRule

Inheritance

Object > AbstractMessageLite<MessageType,BuilderType> > AbstractMessage > GeneratedMessageV3 > RoutingRule

Implements

RoutingRuleOrBuilder

Inherited Members

AbstractMessage.equals(Object)

AbstractMessage.findInitializationErrors()

AbstractMessage.getInitializationErrorString()

AbstractMessage.hashBoolean(boolean)

AbstractMessage.hashCode()

AbstractMessage.hashEnum(Internal.EnumLite)

AbstractMessage.hashEnumList(List<? extends Internal.EnumLite>)

AbstractMessage.hashFields(int,Map<Descriptors.FieldDescriptor,Object>)

AbstractMessage.hashLong(long)

AbstractMessage.toString()

AbstractMessageLite.<T>addAll(Iterable<T>,Collection<? super T>)

AbstractMessageLite.<T>addAll(Iterable<T>,List<? super T>)

AbstractMessageLite.checkByteStringIsUtf8(ByteString)

AbstractMessageLite.toByteArray()

AbstractMessageLite.toByteString()

AbstractMessageLite.writeDelimitedTo(OutputStream)

AbstractMessageLite.writeTo(OutputStream)

com.google.protobuf.GeneratedMessageV3.<ListT>makeMutableCopy(ListT)

com.google.protobuf.GeneratedMessageV3.<ListT>makeMutableCopy(ListT,int)

GeneratedMessageV3.<M>parseDelimitedWithIOException(Parser<M>,InputStream)

GeneratedMessageV3.<M>parseDelimitedWithIOException(Parser<M>,InputStream,ExtensionRegistryLite)

GeneratedMessageV3.<M>parseWithIOException(Parser<M>,CodedInputStream)

GeneratedMessageV3.<M>parseWithIOException(Parser<M>,CodedInputStream,ExtensionRegistryLite)

GeneratedMessageV3.<M>parseWithIOException(Parser<M>,InputStream)

GeneratedMessageV3.<M>parseWithIOException(Parser<M>,InputStream,ExtensionRegistryLite)

com.google.protobuf.GeneratedMessageV3.<T>emptyList(java.lang.Class<T>)

GeneratedMessageV3.<V>serializeBooleanMapTo(CodedOutputStream,MapField<Boolean,V>,MapEntry<Boolean,V>,int)

GeneratedMessageV3.<V>serializeIntegerMapTo(CodedOutputStream,MapField<Integer,V>,MapEntry<Integer,V>,int)

GeneratedMessageV3.<V>serializeLongMapTo(CodedOutputStream,MapField<Long,V>,MapEntry<Long,V>,int)

GeneratedMessageV3.<V>serializeStringMapTo(CodedOutputStream,MapField<String,V>,MapEntry<String,V>,int)

GeneratedMessageV3.canUseUnsafe()

GeneratedMessageV3.computeStringSize(int,Object)

GeneratedMessageV3.computeStringSizeNoTag(Object)

GeneratedMessageV3.emptyBooleanList()

GeneratedMessageV3.emptyDoubleList()

GeneratedMessageV3.emptyFloatList()

GeneratedMessageV3.emptyIntList()

GeneratedMessageV3.emptyLongList()

GeneratedMessageV3.getAllFields()

GeneratedMessageV3.getDescriptorForType()

GeneratedMessageV3.getField(Descriptors.FieldDescriptor)

GeneratedMessageV3.getOneofFieldDescriptor(Descriptors.OneofDescriptor)

GeneratedMessageV3.getParserForType()

GeneratedMessageV3.getRepeatedField(Descriptors.FieldDescriptor,int)

GeneratedMessageV3.getRepeatedFieldCount(Descriptors.FieldDescriptor)

GeneratedMessageV3.getSerializedSize()

GeneratedMessageV3.getUnknownFields()

GeneratedMessageV3.hasField(Descriptors.FieldDescriptor)

GeneratedMessageV3.hasOneof(Descriptors.OneofDescriptor)

GeneratedMessageV3.internalGetFieldAccessorTable()

GeneratedMessageV3.internalGetMapField(int)

com.google.protobuf.GeneratedMessageV3.internalGetMapFieldReflection(int)

GeneratedMessageV3.isInitialized()

GeneratedMessageV3.isStringEmpty(Object)

GeneratedMessageV3.makeExtensionsImmutable()

GeneratedMessageV3.mergeFromAndMakeImmutableInternal(CodedInputStream,ExtensionRegistryLite)

GeneratedMessageV3.mutableCopy(Internal.BooleanList)

GeneratedMessageV3.mutableCopy(Internal.DoubleList)

GeneratedMessageV3.mutableCopy(Internal.FloatList)

GeneratedMessageV3.mutableCopy(Internal.IntList)

GeneratedMessageV3.mutableCopy(Internal.LongList)

GeneratedMessageV3.newBooleanList()

GeneratedMessageV3.newBuilderForType(AbstractMessage.BuilderParent)

GeneratedMessageV3.newBuilderForType(GeneratedMessageV3.BuilderParent)

GeneratedMessageV3.newDoubleList()

GeneratedMessageV3.newFloatList()

GeneratedMessageV3.newInstance(GeneratedMessageV3.UnusedPrivateParameter)

GeneratedMessageV3.newIntList()

GeneratedMessageV3.newLongList()

GeneratedMessageV3.parseUnknownField(CodedInputStream,UnknownFieldSet.Builder,ExtensionRegistryLite,int)

GeneratedMessageV3.parseUnknownFieldProto3(CodedInputStream,UnknownFieldSet.Builder,ExtensionRegistryLite,int)

GeneratedMessageV3.writeReplace()

GeneratedMessageV3.writeString(CodedOutputStream,int,Object)

GeneratedMessageV3.writeStringNoTag(CodedOutputStream,Object)

GeneratedMessageV3.writeTo(CodedOutputStream)

Object.clone()

Object.finalize()

Object.getClass()

Object.notify()

Object.notifyAll()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Fields

ROUTING_PARAMETERS_FIELD_NUMBER

public static final int ROUTING_PARAMETERS_FIELD_NUMBER

Field Value
Type	Description
`int`

Static Methods

getDefaultInstance()

public static RoutingRule getDefaultInstance()

Returns
Type	Description
`RoutingRule`

getDescriptor()

public static final Descriptors.Descriptor getDescriptor()

Returns
Type	Description
`Descriptor`

newBuilder()

public static RoutingRule.Builder newBuilder()

Returns
Type	Description
`RoutingRule.Builder`

newBuilder(RoutingRule prototype)

public static RoutingRule.Builder newBuilder(RoutingRule prototype)

Parameter
Name	Description
`prototype`	`RoutingRule`

Returns
Type	Description
`RoutingRule.Builder`

parseDelimitedFrom(InputStream input)

public static RoutingRule parseDelimitedFrom(InputStream input)

Parameter
Name	Description
`input`	`InputStream`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`input`	`InputStream`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseFrom(byte[] data)

public static RoutingRule parseFrom(byte[] data)

Parameter
Name	Description
`data`	`byte[]`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`data`	`byte[]`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parseFrom(ByteString data)

public static RoutingRule parseFrom(ByteString data)

Parameter
Name	Description
`data`	`ByteString`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`data`	`ByteString`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parseFrom(CodedInputStream input)

public static RoutingRule parseFrom(CodedInputStream input)

Parameter
Name	Description
`input`	`CodedInputStream`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`input`	`CodedInputStream`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseFrom(InputStream input)

public static RoutingRule parseFrom(InputStream input)

Parameter
Name	Description
`input`	`InputStream`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`input`	`InputStream`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`IOException`

parseFrom(ByteBuffer data)

public static RoutingRule parseFrom(ByteBuffer data)

Parameter
Name	Description
`data`	`ByteBuffer`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)

Parameters
Name	Description
`data`	`ByteBuffer`
`extensionRegistry`	`ExtensionRegistryLite`

Returns
Type	Description
`RoutingRule`

Exceptions
Type	Description
`InvalidProtocolBufferException`

parser()

public static Parser<RoutingRule> parser()

Returns
Type	Description
`Parser<RoutingRule>`

Methods

equals(Object obj)

public boolean equals(Object obj)

Parameter
Name	Description
`obj`	`Object`

Returns
Type	Description
`boolean`

Overrides

AbstractMessage.equals(Object other)

getDefaultInstanceForType()

public RoutingRule getDefaultInstanceForType()

Returns
Type	Description
`RoutingRule`

getParserForType()

public Parser<RoutingRule> getParserForType()

Returns
Type	Description
`Parser<RoutingRule>`

Overrides

GeneratedMessageV3.getParserForType()

getRoutingParameters(int index)

public RoutingParameter getRoutingParameters(int index)

A collection of Routing Parameter specifications. NOTE: If multiple Routing Parameters describe the same key (via the path_template field or via the field field when path_template is not provided), "last one wins" rule determines which Parameter gets used. See the examples for more details.