Provide a dedicated method on Mono which is similar to Optional.orElseThrow()

相关文章推荐

热心的黄花菜 · 《和平精英》90帧模式实测：高通骁龙vs麒麟 ...· 10 月前 ·

冷冷的香菜 · 长了一颗“恋爱脑”，是好还是坏· 10 月前 ·

冷冷的自行车 · 河北工业大学土木与交通学院· 1 年前 ·

从容的路灯 · 另一个波琳家的女孩- 知乎· 1 年前 ·

讲道义的水桶 · mindnode Archives - ...· 1 年前 ·

</noscript><div id="___gatsby"><div style="outline:none" tabindex="-1" id="gatsby-focus-wrapper"><header class="TemplateHeader-module--header--f6398 "><div class="Container-module--largeContainer--94cb8"><div class="TemplateHeader-module--wrapper--8e3ea"><a href="https://www.lightrun.com"><img src="data:image/svg+xml;base64,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" alt="Lightrun" class="TemplateHeader-module--logoImg--5e9c4"/></a><nav class="TemplateHeader-module--navWrapper--b3c39"><div class="TemplateHeader-module--navList--a14d9"><div class="TemplateHeader-module--btnMenu--375a2"><button class="TemplateHeader-module--item--c5b2d">Dev Observability <img src="data:image/svg+xml;base64,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" alt="arrow_down"/></button><div class="SharedMenu-module--wrapperContainer--6e38e "><div class="SharedMenu-module--wrapper--49c2c"><p class="titleGradient">Dev Observability</p><div class="SharedMenu-module--menuList--d425c"><a href="https://lightrun.com/developer-observability/" class="SharedMenu-module--link--ad046">What is Developer Observability?</a><a href="https://lightrun.com/why-lightrun/" class="SharedMenu-module--link--ad046">Why Lightrun?</a><a href="https://lightrun.com/architecture/" class="SharedMenu-module--link--ad046">Lightrun Architecture</a><a href="https://lightrun.com/sdk/" class="SharedMenu-module--link--ad046"><span>The Lightrun SDK</span><sup>TM</sup></a><a href="https://lightrun.com/plugin/" class="SharedMenu-module--link--ad046">The Lightrun IDE Plugin</a><a href="https://lightrun.com/security/" class="SharedMenu-module--link--ad046">Security</a><a href="https://lightrun.com/comparisons/" class="SharedMenu-module--link--ad046">Comparisons</a><a href="https://lightrun.com/integrations/" class="SharedMenu-module--link--ad046">Integrations</a></div><div class="SharedMenu-module--arrow--d0e9b "/></div></div></div><div class="TemplateHeader-module--btnMenu--375a2"><button class="TemplateHeader-module--item--c5b2d">Product <img src="data:image/svg+xml;base64,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" alt="arrow_down"/></button><div class="SharedMenu-module--wrapperContainer--6e38e SharedMenu-module--expandedMenuContainer--4c975"><div class="SharedMenu-module--wrapper--49c2c"><div class="SharedMenu-module--productWrapper--40db0"><div><div class="titleGradient">Architectures</div><div class="SharedMenu-module--mainBlockMenu--064a3"><div class="SharedMenu-module--menuBlock--9a914"><div class="SharedMenu-module--subTitleList--11ca1">Deployment Patterns</div><div class="SharedMenu-module--menuList--d425c"><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/kubernetes-troubleshooting/">Kubernetes Debugging</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/serverless-debugging/">Serverless Debugging</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/feature-flag-validation/">Feature Flag Debugging</a></div></div><div class="SharedMenu-module--menuBlock--9a914"><div class="SharedMenu-module--subTitleList--11ca1">Environments</div><div class="SharedMenu-module--menuList--d425c"><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/enviroments/dev-qa-staging/">Dev/QA/Staging</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/enviroments/ci-cd-pipelines/">CI/CD</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/enviroments/production/">Production</a></div></div></div></div><div><div class="titleGradient">Roles</div><div class="SharedMenu-module--mainBlockMenu--064a3"><div><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/roles/backend-developer/">Backend Developer</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/roles/devops-sre/">DevOps Engineer/SRE</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/roles/engineering-leader/">Engineering Leader</a></div></div></div><div><div class="titleGradient">Benefits</div><div class="SharedMenu-module--mainBlockMenu--064a3"><div><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/use-cases/reduce-mttr/">Reduce MTTR</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/use-cases/improve-developer-productivity/">Improve Dev Productivity</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/use-cases/optimize-logging-costs/">Optimize Logging Costs</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/use-cases/reduce-time-to-market/">Reduce Time to Market</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/use-cases/improve-dora-metrics/">Improove DORA metrics</a></div></div></div><div><div class="titleGradient">Features</div><div class="SharedMenu-module--mainBlockMenu--064a3"><div><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/logs/">Dynamic Logs</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/metrics/">Zero-config Metrics</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/snapshots/">Snapshots (Virtual Breakpoints)</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/integrations/#">Integrations</a><a class="SharedMenu-module--link--ad046" href="https://lightrun.com/integrations/#">Comparisons</a></div></div></div><div class="SharedMenu-module--watchNowBar--38120"><div class="WatchNow-module--watchNow--0a727 SharedMenu-module--watchBarPanel--43c6e"><span class="titleGradient WatchNow-module--newTitle--646e1">NEW!</span><span class="WatchNow-module--description--bb7f0">Watch our log cost reduction masterclass with Google, Shopify and the CNCF!<a href="https://lightrun.com/resources/the-hidden-cost-of-overlogging/" class="WatchNow-module--watchNowLink--22d33">Watch Now&gt;</a></span></div></div></div><div class="SharedMenu-module--arrow--d0e9b SharedMenu-module--expandedMenuArrow--4fdac"/></div></div></div><a href="https://lightrun.com/pricing" class="TemplateHeader-module--item--c5b2d">Pricing</a><a href="https://docs.lightrun.com/" class="TemplateHeader-module--item--c5b2d">Docs</a><div class="TemplateHeader-module--btnMenu--375a2"><button class="TemplateHeader-module--item--c5b2d">Resources <img src="data:image/svg+xml;base64,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" alt="arrow_down"/></button><div class="SharedMenu-module--wrapperContainer--6e38e "><div class="SharedMenu-module--wrapper--49c2c"><p class="titleGradient">Resources</p><div class="SharedMenu-module--menuList--d425c"><a href="https://lightrun.com/categories_resources/case-studies/" class="SharedMenu-module--link--ad046">Case studies</a><a href="https://lightrun.com/categories_resources/data-sheets/" class="SharedMenu-module--link--ad046">Data Sheets</a><a href="https://lightrun.com/categories_resources/press/" class="SharedMenu-module--link--ad046">Press</a><a href="https://lightrun.com/categories_resources/webinars/" class="SharedMenu-module--link--ad046">Webinars</a></div><div class="SharedMenu-module--arrow--d0e9b "/></div></div></div><a href="https://lightrun.com/blog/" class="TemplateHeader-module--item--c5b2d">Blog</a><div class="TemplateHeader-module--btnMenu--375a2"><button class="TemplateHeader-module--item--c5b2d">Company <img src="data:image/svg+xml;base64,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" alt="arrow_down"/></button><div class="SharedMenu-module--wrapperContainer--6e38e "><div class="SharedMenu-module--wrapper--49c2c"><p class="titleGradient">Company</p><div class="SharedMenu-module--menuList--d425c"><a href="https://www.linkedin.com/company/lightruntech/jobs/" class="SharedMenu-module--link--ad046">Careers</a><a href="https://go.lightrun.com/contact-us" class="SharedMenu-module--link--ad046">Contact Us</a></div><div class="SharedMenu-module--arrow--d0e9b "/></div></div></div><a href="https://playground.lightrun.com" class="TemplateHeader-module--item--c5b2d TemplateHeader-module--itemWordle--b9122"><span class="TemplateHeader-module--linkWord--2d9ef">Debug 🆆🅾🆁🅳🅻🅴</span></a></div><ul class="ControlButtons-module--linkList--df15b"><li class="ControlButtons-module--underLine--a2f91"><a href="https://app.lightrun.com/api/oauth/login">Log in</a></li><li class="ControlButtons-module--item--da1af"><a href="https://lightrun.com/get-a-lightrun-demo/" class="ButtonLink-module--linkBtn--3a273 ButtonLink-module--transparent--5a2f9 ">Book a Demo</a></li><li class="ControlButtons-module--item--da1af"><a href="https://app.lightrun.com/api/oauth/register" class="ButtonLink-module--linkBtn--3a273 ButtonLink-module--fill--6b8b9 ">Start For Free</a></li></ul></nav><button class="Burger-module--burger--9ead4 " title="Navigation"><span class="Burger-module--line--8f8d0"/><span class="Burger-module--line--8f8d0"/><span class="Burger-module--line--8f8d0"/></button></div><div class="TemplateHeader-module--menu--44853 "><div class="MobileMenu-module--mobileMenu--040cc"><div class="Container-module--container--052f0"><ul class="MobileMenu-module--containerNav--c271d"><li class="MobileMenu-module--navItem--99a59"><div class="MobileMenu-module--titleMenuItem--d0f06"><span>Dev Observability</span><img src="data:image/svg+xml;base64,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" alt="arrow" class="MobileMenu-module--arrow--1311d "/></div></li><li class="MobileMenu-module--navItem--99a59"><div class="MobileMenu-module--titleMenuItem--d0f06"><span>Product</span><img src="data:image/svg+xml;base64,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" alt="arrow" class="MobileMenu-module--arrow--1311d "/></div></li><li class="MobileMenu-module--navItem--99a59"><a href="https://lightrun.com/pricing" class="MobileMenu-module--linkMenuItem--341df">Pricing</a></li><li class="MobileMenu-module--navItem--99a59"><a href="https://docs.lightrun.com/" class="MobileMenu-module--linkMenuItem--341df">Docs</a></li><li class="MobileMenu-module--navItem--99a59"><div class="MobileMenu-module--titleMenuItem--d0f06"><span>Resources</span><img src="data:image/svg+xml;base64,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" alt="arrow" class="MobileMenu-module--arrow--1311d "/></div></li><li class="MobileMenu-module--navItem--99a59"><a href="https://lightrun.com/blog/" class="MobileMenu-module--linkMenuItem--341df">Blog</a></li><li class="MobileMenu-module--navItem--99a59"><div class="MobileMenu-module--titleMenuItem--d0f06"><span>Company</span><img src="data:image/svg+xml;base64,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" alt="arrow" class="MobileMenu-module--arrow--1311d "/></div></li><li class="MobileMenu-module--navItem--99a59"><a href="https://playground.lightrun.com" class="MobileMenu-module--linkMenuItem--341df">Debug Wordle</a></li></ul><div class="MobileMenu-module--controlButtons--b6016"><ul class="ControlButtons-module--linkList--df15b"><li class="ControlButtons-module--underLine--a2f91"><a href="https://app.lightrun.com/api/oauth/login">Log in</a></li><li class="ControlButtons-module--item--da1af"><a href="https://lightrun.com/get-a-lightrun-demo/" class="ButtonLink-module--linkBtn--3a273 ButtonLink-module--transparent--5a2f9 ">Book a Demo</a></li><li class="ControlButtons-module--item--da1af"><a href="https://app.lightrun.com/api/oauth/register" class="ButtonLink-module--linkBtn--3a273 ButtonLink-module--fill--6b8b9 ">Start For Free</a></li></ul></div></div></div></div></div></header><main><div class="Hero-module--hero--e76bd"><div class="Container-module--container--052f0"><div class="Hero-module--overlay--92431"><img src="/answers/static/question-mark-6a6962885f54fa6c88cf5e38232283da.png" alt="question-mark" class="Hero-module--heroImg--8554a"/><div class="Hero-module--wrapper--29990"><h1>Stuck on an issue?</h1><p class="Hero-module--description--894ed">Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.<br/></p><p class="Hero-module--description--894ed Hero-module--strongText--4ea65">And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.</p><button class="Hero-module--btnHero--4efca">Talk to a Lightrun Answers expert</button></div></div></div></div><section class="sectionWrapper IssueSummary-module--issueSummary--29ccb"><div class="Container-module--container--052f0"><div class="IssueSummary-module--wrapper--5e867"><h2 class="IssueSummary-module--title--1229e">Provide a dedicated method on Mono which is similar to Optional.orElseThrow()</h2><a href="https://github.com/reactor/reactor-core/issues/917" class="IssueSummary-module--linkUnderline--4cc7f">See original GitHub issue</a></div><div class="IssueSummary-module--wrapperGrid--5ff55"><div class="IssueSummary-module--descriptionWrapper--3a1cb"><h3>Issue Description</h3><div class="LeftScrollContainer-module--wrapper--9987b IssueSummary-module--textContainer--3e705 "><div class="LeftScrollContainer-module--content--0b83d"><div><p>Sorry if this exists already but I couldn’t find it.</p> <h3>Expected behavior</h3> <p>An easy way to specify exceptions (lazily) in case the Mono is empty. Something that would allow to do this:</p> <p><code>Mono.empty().errorIfEmpty(() -&gt; new RuntimeException())</code></p> <p>Currently we can do:</p> <p><code>Mono.empty().switchIfEmpty(Mono.error(new RuntimeException()))</code> which is not lazy (the exception is always created)</p> <p><code>Mono.empty().switchIfEmpty(Mono.defer(() -&gt; Mono.error(new RuntimeException())))</code> which is lazy but verbose.</p> <p>Alternatively it would be enough (and more general) if we had a “defer” variant for <code>switchIfEmpty</code> which would take a <code>Supplier&lt;Mono&gt;</code> similar to <code>defer()</code>. Then we could do:</p> <p><code>Mono.empty().deferSwitchIfEmpty(() -&gt; Mono.error(new RuntimeException()))</code></p> <p>It is more verbose than a dedicated <code>errorIfEmpty</code> however.</p> <h3>Reactor Core version</h3> <p>3.1.0.RELEASE</p> </div></div></div></div><div class="IssueSummary-module--descriptionWrapper--3a1cb"><h3>Issue Analytics</h3><ul class="IssueSummary-module--analyticsWrapper--8f2e1"><li><span class="IssueSummary-module--boldTitle--7ed35">State:</span><img src="data:image/svg+xml;base64,<svg width="91" height="31" viewBox="0 0 91 31" fill="none" xmlns="http://www.w3.org/2000/svg">
<rect x="0.75" y="0.451172" width="89.5" height="30" rx="15" fill="#BE0000"/>
<path d="M40.4261 13.4512H39.1932C39.1203 13.0965 38.9927 12.785 38.8104 12.5165C38.6314 12.248 38.4126 12.0227 38.1541 11.8404C37.8989 11.6548 37.6155 11.5156 37.304 11.4228C36.9924 11.33 36.6676 11.2836 36.3295 11.2836C35.7131 11.2836 35.1546 11.4393 34.6541 11.7509C34.157 12.0624 33.7609 12.5215 33.4659 13.128C33.1742 13.7346 33.0284 14.4786 33.0284 15.3603C33.0284 16.2419 33.1742 16.986 33.4659 17.5925C33.7609 18.199 34.157 18.6581 34.6541 18.9696C35.1546 19.2812 35.7131 19.437 36.3295 19.437C36.6676 19.437 36.9924 19.3906 37.304 19.2978C37.6155 19.205 37.8989 19.0674 38.1541 18.8851C38.4126 18.6995 38.6314 18.4725 38.8104 18.204C38.9927 17.9322 39.1203 17.6207 39.1932 17.2694H40.4261C40.3333 17.7897 40.1643 18.2554 39.919 18.6664C39.6738 19.0774 39.3688 19.427 39.0043 19.7154C38.6397 20.0004 38.2304 20.2175 37.7763 20.3667C37.3255 20.5158 36.8433 20.5904 36.3295 20.5904C35.4612 20.5904 34.6889 20.3783 34.0128 19.954C33.3366 19.5298 32.8047 18.9266 32.4169 18.1444C32.0291 17.3622 31.8352 16.4341 31.8352 15.3603C31.8352 14.2864 32.0291 13.3584 32.4169 12.5762C32.8047 11.794 33.3366 11.1908 34.0128 10.7665C34.6889 10.3423 35.4612 10.1301 36.3295 10.1301C36.8433 10.1301 37.3255 10.2047 37.7763 10.3539C38.2304 10.503 38.6397 10.7218 39.0043 11.0101C39.3688 11.2952 39.6738 11.6432 39.919 12.0542C40.1643 12.4618 40.3333 12.9275 40.4261 13.4512ZM43.4327 10.2694V20.4512H42.2594V10.2694H43.4327ZM48.6839 20.6103C47.9946 20.6103 47.3897 20.4462 46.8693 20.1181C46.3523 19.79 45.9479 19.3309 45.6562 18.7409C45.3679 18.151 45.2237 17.4616 45.2237 16.6728C45.2237 15.8773 45.3679 15.1829 45.6562 14.5897C45.9479 13.9964 46.3523 13.5357 46.8693 13.2076C47.3897 12.8794 47.9946 12.7154 48.6839 12.7154C49.3733 12.7154 49.9766 12.8794 50.4936 13.2076C51.014 13.5357 51.4183 13.9964 51.7067 14.5897C51.9983 15.1829 52.1442 15.8773 52.1442 16.6728C52.1442 17.4616 51.9983 18.151 51.7067 18.7409C51.4183 19.3309 51.014 19.79 50.4936 20.1181C49.9766 20.4462 49.3733 20.6103 48.6839 20.6103ZM48.6839 19.5563C49.2076 19.5563 49.6385 19.4221 49.9766 19.1536C50.3146 18.8851 50.5649 18.5321 50.7273 18.0946C50.8897 17.6571 50.9709 17.1832 50.9709 16.6728C50.9709 16.1623 50.8897 15.6867 50.7273 15.2459C50.5649 14.8051 50.3146 14.4488 49.9766 14.177C49.6385 13.9052 49.2076 13.7694 48.6839 13.7694C48.1603 13.7694 47.7294 13.9052 47.3913 14.177C47.0533 14.4488 46.803 14.8051 46.6406 15.2459C46.4782 15.6867 46.397 16.1623 46.397 16.6728C46.397 17.1832 46.4782 17.6571 46.6406 18.0946C46.803 18.5321 47.0533 18.8851 47.3913 19.1536C47.7294 19.4221 48.1603 19.5563 48.6839 19.5563ZM59.3443 14.525L58.2903 14.8233C58.224 14.6477 58.1262 14.477 57.997 14.3113C57.871 14.1422 57.6987 14.003 57.4799 13.8936C57.2612 13.7843 56.9811 13.7296 56.6397 13.7296C56.1724 13.7296 55.783 13.8373 55.4714 14.0527C55.1632 14.2649 55.0091 14.535 55.0091 14.8631C55.0091 15.1548 55.1151 15.3851 55.3272 15.5542C55.5394 15.7232 55.8708 15.8641 56.3216 15.9767L57.4551 16.2551C58.1378 16.4209 58.6466 16.6744 58.9814 17.0158C59.3161 17.3539 59.4835 17.7897 59.4835 18.3233C59.4835 18.7608 59.3575 19.1519 59.1056 19.4966C58.8571 19.8413 58.5091 20.1131 58.0616 20.312C57.6142 20.5108 57.0938 20.6103 56.5005 20.6103C55.7217 20.6103 55.077 20.4412 54.5666 20.1032C54.0562 19.7651 53.733 19.2712 53.5971 18.6216L54.7108 18.3432C54.8168 18.7542 55.0173 19.0624 55.3123 19.2679C55.6106 19.4734 56.0001 19.5762 56.4806 19.5762C57.0275 19.5762 57.4617 19.4602 57.7832 19.2282C58.108 18.9928 58.2704 18.7111 58.2704 18.383C58.2704 18.1178 58.1776 17.8958 57.992 17.7168C57.8064 17.5345 57.5214 17.3986 57.1369 17.3091L55.8642 17.0108C55.1648 16.8451 54.6511 16.5882 54.323 16.2402C53.9982 15.8889 53.8358 15.4498 53.8358 14.9228C53.8358 14.4919 53.9567 14.1107 54.1987 13.7793C54.444 13.4479 54.777 13.1877 55.198 12.9988C55.6222 12.8098 56.1028 12.7154 56.6397 12.7154C57.3954 12.7154 57.9887 12.8811 58.4196 13.2125C58.8538 13.544 59.162 13.9815 59.3443 14.525ZM64.4513 20.6103C63.7156 20.6103 63.0808 20.4479 62.5472 20.123C62.0169 19.7949 61.6076 19.3375 61.3192 18.7509C61.0342 18.1609 60.8917 17.4748 60.8917 16.6926C60.8917 15.9105 61.0342 15.2211 61.3192 14.6245C61.6076 14.0246 62.0086 13.5572 62.5224 13.2225C63.0394 12.8844 63.6426 12.7154 64.332 12.7154C64.7298 12.7154 65.1225 12.7817 65.5103 12.9142C65.8981 13.0468 66.2511 13.2623 66.5692 13.5605C66.8874 13.8555 67.141 14.2466 67.3299 14.7338C67.5188 15.2211 67.6133 15.821 67.6133 16.5336V17.0307H61.7269V16.0165H66.4201C66.4201 15.5856 66.3339 15.2012 66.1616 14.8631C65.9925 14.525 65.7506 14.2582 65.4357 14.0627C65.1242 13.8671 64.7563 13.7694 64.332 13.7694C63.8647 13.7694 63.4603 13.8854 63.119 14.1174C62.7809 14.3461 62.5207 14.6444 62.3384 15.0123C62.1561 15.3801 62.065 15.7746 62.065 16.1955V16.8716C62.065 17.4483 62.1644 17.9372 62.3633 18.3382C62.5655 18.736 62.8455 19.0392 63.2035 19.248C63.5614 19.4535 63.9774 19.5563 64.4513 19.5563C64.7596 19.5563 65.038 19.5132 65.2866 19.427C65.5385 19.3375 65.7556 19.205 65.9379 19.0293C66.1201 18.8503 66.261 18.6283 66.3604 18.3631L67.494 18.6813C67.3746 19.0658 67.1741 19.4038 66.8924 19.6955C66.6107 19.9838 66.2627 20.2092 65.8484 20.3716C65.4341 20.5307 64.9684 20.6103 64.4513 20.6103ZM72.2816 20.6103C71.6452 20.6103 71.0835 20.4495 70.5962 20.128C70.109 19.8032 69.7279 19.3458 69.4528 18.7559C69.1777 18.1626 69.0401 17.4616 69.0401 16.6529C69.0401 15.8508 69.1777 15.1548 69.4528 14.5648C69.7279 13.9748 70.1107 13.5191 70.6012 13.1976C71.0917 12.8761 71.6585 12.7154 72.3015 12.7154C72.7987 12.7154 73.1914 12.7982 73.4798 12.964C73.7714 13.1264 73.9935 13.312 74.146 13.5208C74.3017 13.7263 74.4227 13.8953 74.5089 14.0279H74.6083V10.2694H75.7816V20.4512H74.6481V19.2779H74.5089C74.4227 19.4171 74.3001 19.5927 74.141 19.8049C73.9819 20.0137 73.7549 20.2009 73.4599 20.3667C73.1649 20.5291 72.7721 20.6103 72.2816 20.6103ZM72.4407 19.5563C72.9113 19.5563 73.3091 19.4337 73.6339 19.1884C73.9587 18.9398 74.2056 18.5968 74.3746 18.1593C74.5437 17.7185 74.6282 17.2097 74.6282 16.633C74.6282 16.0629 74.5453 15.5641 74.3796 15.1365C74.2139 14.7057 73.9686 14.3709 73.6438 14.1323C73.319 13.8903 72.918 13.7694 72.4407 13.7694C71.9435 13.7694 71.5292 13.897 71.1978 14.1522C70.8697 14.4041 70.6228 14.7471 70.457 15.1813C70.2946 15.6122 70.2134 16.0961 70.2134 16.633C70.2134 17.1766 70.2963 17.6704 70.462 18.1145C70.631 18.5553 70.8796 18.9067 71.2077 19.1685C71.5392 19.427 71.9502 19.5563 72.4407 19.5563Z" fill="white"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M22.6849 14.7047H23.468C23.609 14.7047 23.7444 14.7607 23.8442 14.8604C23.9439 14.9602 24 15.0955 24 15.2365V21.9609C24 22.1019 23.9438 22.2372 23.8442 22.337C23.7444 22.4367 23.6091 22.4927 23.4681 22.4927H14.5319C14.3909 22.4927 14.2556 22.4367 14.1558 22.337C14.0561 22.2372 14 22.1019 14 21.9609V15.2365C14 15.0955 14.0562 14.9602 14.1558 14.8604C14.2556 14.7607 14.3909 14.7047 14.5319 14.7047H15.2944V11.8577C15.3817 10.5978 16.1048 9.46898 17.2129 8.86282C18.3209 8.25666 19.6614 8.25666 20.7694 8.86282C21.8776 9.46898 22.6006 10.5978 22.6879 11.8577H22.6849V14.7047ZM21.6221 14.7047V11.8493H21.6233C21.5478 10.9633 21.0314 10.1745 20.249 9.75083C19.4643 9.32587 18.518 9.32587 17.7331 9.75083C16.9484 10.1758 16.4312 10.9683 16.3581 11.8577V14.7047H21.6221Z" fill="white"/>
</svg>
" alt="closed"/></li><li>Created 5 years ago</li><li><span class="IssueSummary-module--boldTitle--7ed35">Reactions:</span><span>2</span></li><li><span class="IssueSummary-module--boldTitle--7ed35">Comments:</span><span>11 (8 by maintainers)</span></li></ul></div></div></div></section><section class="sectionWrapper TopResultsSection-module--topResultsSection--ece62"><div class="Container-module--container--052f0"><div class="TopResultsSection-module--wrapper--4186d"><section class="TopGitHubComments-module--commentsSection--674bb"><h4 class="H4-module--title--7a773 "><img src="/answers/static/github_icon-09b634433ea463575cb8c3c7818ee4e2.svg" alt="github_icon"/>Top GitHub Comments</h4><div class="TopGitHubComments-module--commentsContainer--87a5a"><div class="TopGitHubComments-module--commentsWrapper--89d00"><div class="TopGitHubComments-module--itemWrapper--c6dba"><div class="TopGitHubComments-module--itemHead--c0a84"><div class="TopGitHubComments-module--itemReactions--3aa39"><span class="TopGitHubComments-module--count--e5170">5</span><span class="TopGitHubComments-module--description--034b2">reactions</span></div><a href="https://github.com/reactor/reactor-core/issues/917#issuecomment-339630938" class="TopGitHubComments-module--name--a03f6">simonbasle</a><span class="TopGitHubComments-module--itemTitle--6bdb1">commented, Oct 26, 2017</span></div><div class="LeftScrollContainer-module--wrapper--9987b TopGitHubComments-module--scrollContainer--9d8cc"><div class="LeftScrollContainer-module--content--0b83d"><div><p>I’m not sure we want to add a dedicated operator for that, especially since there is an obvious (albeit verbose) workaround, as you have found.</p> <p>It is a normal and desirable thing to rely on operator composition in a library like Reactor.</p> <p>What I’d suggest instead, to remove some of the verbosity, is to put the switch/defer/error boilerplate into a method to use with <code>transform</code>:</p> <pre><code class="language-java">public &lt;T&gt; Mono&lt;T&gt; errorIfEmpty(Mono&lt;T&gt; source) { return source.switchIfEmpty(Mono.defer(() -&gt; Mono.error(new RuntimeException()))); Mono&lt;String&gt; foo = Mono.empty().transform(this::errorIfEmpty); <p>With the added advantage that it can be reused on other <code>Mono</code>s.</p> </div></div></div></div><div class="TopGitHubComments-module--itemWrapper--c6dba"><div class="TopGitHubComments-module--itemHead--c0a84"><div class="TopGitHubComments-module--itemReactions--3aa39"><span class="TopGitHubComments-module--count--e5170">3</span><span class="TopGitHubComments-module--description--034b2">reactions</span></div><a href="https://github.com/reactor/reactor-core/issues/917#issuecomment-339669928" class="TopGitHubComments-module--name--a03f6">akiraly</a><span class="TopGitHubComments-module--itemTitle--6bdb1">commented, Oct 26, 2017</span></div><div class="LeftScrollContainer-module--wrapper--9987b TopGitHubComments-module--scrollContainer--9d8cc"><div class="LeftScrollContainer-module--content--0b83d"><div><p>Just for completeness this is the variant I came up with:</p> <pre><code class="language-java"> public &lt;R&gt; Mono&lt;R&gt; errorIfEmpty(Mono&lt;R&gt; mono, Supplier&lt;Throwable&gt; throwableSupplier) { requireNonNull(mono, "mono"); requireNonNull(throwableSupplier, "throwableSupplier"); return mono.switchIfEmpty(Mono.defer(() -&gt; Mono.error(throwableSupplier.get())));