78 lines
2.9 KiB
JavaScript
78 lines
2.9 KiB
JavaScript
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"use strict";
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/*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.QueuePicker = exports.UnavailablePicker = exports.PickResultType = void 0;
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const metadata_1 = require("./metadata");
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const constants_1 = require("./constants");
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var PickResultType;
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(function (PickResultType) {
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PickResultType[PickResultType["COMPLETE"] = 0] = "COMPLETE";
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PickResultType[PickResultType["QUEUE"] = 1] = "QUEUE";
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PickResultType[PickResultType["TRANSIENT_FAILURE"] = 2] = "TRANSIENT_FAILURE";
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PickResultType[PickResultType["DROP"] = 3] = "DROP";
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})(PickResultType || (exports.PickResultType = PickResultType = {}));
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/**
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* A standard picker representing a load balancer in the TRANSIENT_FAILURE
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* state. Always responds to every pick request with an UNAVAILABLE status.
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*/
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class UnavailablePicker {
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constructor(status) {
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this.status = Object.assign({ code: constants_1.Status.UNAVAILABLE, details: 'No connection established', metadata: new metadata_1.Metadata() }, status);
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}
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pick(pickArgs) {
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return {
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pickResultType: PickResultType.TRANSIENT_FAILURE,
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subchannel: null,
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status: this.status,
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onCallStarted: null,
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onCallEnded: null,
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};
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}
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}
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exports.UnavailablePicker = UnavailablePicker;
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/**
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* A standard picker representing a load balancer in the IDLE or CONNECTING
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* state. Always responds to every pick request with a QUEUE pick result
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* indicating that the pick should be tried again with the next `Picker`. Also
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* reports back to the load balancer that a connection should be established
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* once any pick is attempted.
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*/
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class QueuePicker {
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// Constructed with a load balancer. Calls exitIdle on it the first time pick is called
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constructor(loadBalancer) {
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this.loadBalancer = loadBalancer;
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this.calledExitIdle = false;
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}
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pick(pickArgs) {
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if (!this.calledExitIdle) {
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process.nextTick(() => {
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this.loadBalancer.exitIdle();
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});
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this.calledExitIdle = true;
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}
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return {
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pickResultType: PickResultType.QUEUE,
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subchannel: null,
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status: null,
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onCallStarted: null,
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onCallEnded: null,
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};
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}
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}
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exports.QueuePicker = QueuePicker;
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//# sourceMappingURL=picker.js.map
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