Class RoutingRule (2.10.0)

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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: // - projects/<project>/tables/<table> // - projects/<project>/instances/<instance>/tables/<table> // - region/<region>/zones/<zone>/tables/<table> string table_name = 1; // This value specifies routing for replication. // It can be in the following formats: // - profiles/<profile_id> // - a legacy profile_id 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 app_profile_id. 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 app_profile_id, but name it routing_id 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 table_name, if it's well-formed (with project-based // syntax). routing_parameters { field: "table_name" path_template: "{table_name=projects/*/instances/*/*}" } }; 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 table_name, if it's well-formed (with region-based // syntax). routing_parameters { field: "table_name" path_template: "{table_name=regions/*/zones/*/*}" } }; result: <no routing header will be sent> 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 table_name, if it's well-formed, whether // using the region- or projects-based syntax. routing_parameters { field: "table_name" path_template: "{table_name=regions/*/zones/*/*}" } routing_parameters { field: "table_name" path_template: "{table_name=projects/*/instances/*/*}" } }; 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 table_name field. routing_parameters { field: "table_name" path_template: "{routing_id=projects/*}/*" } }; 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 table_name 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/*}/*" } routing_parameters { field: "table_name" path_template: "{routing_id=projects/*/instances/*}/*" } }; 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/*}/instances/*/*" } routing_parameters { field: "table_name" path_template: "projects/*/{instance_id=instances/*}/*" } }; result: x-goog-request-params: project_id=projects/proj_foo&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 project_id for tables without // an instance in the table_name. routing_parameters { field: "table_name" path_template: "{project_id=projects/*}/*" } routing_parameters { field: "table_name" path_template: "projects/*/{instance_id=instances/*}/*" } }; 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&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 project_id and routing_id // (from the app_profile_id field) for routing. routing_parameters { field: "table_name" path_template: "{project_id=projects/*}/*" } routing_parameters { field: "app_profile_id" path_template: "{routing_id=}" } }; result: x-goog-request-params: project_id=projects/proj_foo&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 routing_id can be a project id or a region id depending on // the table name format, but only if the app_profile_id is not set. // If app_profile_id is set it should be used instead. routing_parameters { field: "table_name" path_template: "{routing_id=projects/*}/*" } routing_parameters { field: "table_name" path_template: "{routing_id=regions/*}/*" } 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 table_location and a routing_id are needed. // // table_location can be either an instance id or a region+zone id. // // For routing_id, take the value of app_profile_id // - If it's in the format profiles/<profile_id>, send // just the <profile_id> part. // - If it's any other literal, send it as is. // If the app_profile_id is empty, and the table_name starts with // the project_id, send that instead. routing_parameters { field: "table_name" path_template: "projects/*/{table_location=instances/*}/tables/*" } routing_parameters { field: "table_name" path_template: "{table_location=regions/*/zones/*}/tables/*" } routing_parameters { field: "table_name" path_template: "{routing_id=projects/*}/**" } 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&routing_id=prof_qux

Protobuf type google.api.RoutingRule

Static Fields

ROUTING_PARAMETERS_FIELD_NUMBER

public static final int ROUTING_PARAMETERS_FIELD_NUMBER
Field Value
TypeDescription
int

Static Methods

getDefaultInstance()

public static RoutingRule getDefaultInstance()
Returns
TypeDescription
RoutingRule

getDescriptor()

public static final Descriptors.Descriptor getDescriptor()
Returns
TypeDescription
Descriptor

newBuilder()

public static RoutingRule.Builder newBuilder()
Returns
TypeDescription
RoutingRule.Builder

newBuilder(RoutingRule prototype)

public static RoutingRule.Builder newBuilder(RoutingRule prototype)
Parameter
NameDescription
prototypeRoutingRule
Returns
TypeDescription
RoutingRule.Builder

parseDelimitedFrom(InputStream input)

public static RoutingRule parseDelimitedFrom(InputStream input)
Parameter
NameDescription
inputInputStream
Returns
TypeDescription
RoutingRule
Exceptions
TypeDescription
IOException

parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
Parameters
NameDescription
inputInputStream
extensionRegistryExtensionRegistryLite
Returns
TypeDescription
RoutingRule
Exceptions
TypeDescription
IOException

parseFrom(byte[] data)

public static RoutingRule parseFrom(byte[] data)
Parameter
NameDescription
databyte[]
Returns
TypeDescription
RoutingRule
Exceptions
TypeDescription
InvalidProtocolBufferException

parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)

public static RoutingRule parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
Parameters
NameDescription
databyte[]
extensionRegistryExtensionRegistryLite
Returns
TypeDescription
RoutingRule
Exceptions
TypeDescription
InvalidProtocolBufferException

parseFrom(ByteString data)

public static RoutingRule parseFrom(ByteString data)
Parameter
NameDescription
dataByteString
Returns
TypeDescription
RoutingRule
Exceptions
TypeDescription
InvalidProtocolBufferException