/* Copyright 2017 Google Inc.
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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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* 2019.12.15-changed constructor TokenRefresher
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* Huawei Technologies Co., Ltd.
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*
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*/
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package com.huawei.push.messaging;
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import com.huawei.push.util.ValidatorUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.concurrent.Future;
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/**
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* Utility class for scheduling proactive token refresh events. Each HuaweiApp should have
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* its own instance of this class. TokenRefresher schedules token refresh events when token is expired.
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*
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* <p>This class is thread safe. It will handle only one token change event at a time. It also
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* cancels any pending token refresh events, before scheduling a new one.
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*/
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public class TokenRefresher {
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private static final Logger logger = LoggerFactory.getLogger(TokenRefresher.class);
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private HuaweiApp app;
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private HuaweiCredential credential;
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private Future future;
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public TokenRefresher(HuaweiApp app) {
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ValidatorUtils.checkArgument(app != null, "app must not be null");
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this.app = app;
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this.credential = app.getOption().getCredential();
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}
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protected void scheduleNext(Runnable task, long initialDelay, long period) {
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logger.debug("Scheduling next token refresh in {} milliseconds", period);
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try {
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future = app.schedule(task, initialDelay, period);
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} catch (UnsupportedOperationException e) {
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logger.debug("Failed to schedule token refresh event", e);
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}
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}
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/**
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* Schedule a forced token refresh to be executed after a specified period.
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*
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* @param period in milliseconds, after which the token should be forcibly refreshed.
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*/
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public void scheduleRefresh(final long period) {
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cancelPrevious();
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scheduleNext(() -> credential.refreshToken(), period, period);
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}
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private void cancelPrevious() {
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if (future != null) {
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future.cancel(true);
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}
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}
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/**
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* Starts the TokenRefresher if not already started. Starts refreshing when token is expired. If no active
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* token is present, or if the available token is expired soon, this will also refresh immediately.
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*/
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final synchronized void start() {
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logger.debug("Starting the proactive token refresher");
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String accessToken = credential.getAccessToken();
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long refreshDelay;
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if (accessToken == null || StringUtils.isEmpty(accessToken)) {
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credential.refreshToken();
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}
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refreshDelay = credential.getExpireIn();
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scheduleRefresh(refreshDelay);
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}
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final synchronized void stop() {
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cancelPrevious();
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logger.debug("Stopped the proactive token refresher");
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}
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}
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