Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Event-driven microservices communicate by publishing messages about business events—facts such as an order being placed—so other services can react without a direct call from the producer. This can reduce request-time coupling and support independent consumers, but it does not remove coupling: teams still have to manage event meaning, delivery, ordering, consistency, retries, and observability. The approach works best when those costs fit the workflow and the team can operate them.
What event-driven microservices are—and are not
In an event-driven architecture, a service publishes a message when something relevant happens, and one or more consumers handle it. For example, an Order service might publish OrderPlaced; a fulfillment service can reserve stock while a notification service prepares a confirmation. The producer need not call each consumer directly.
An event records a fact; a command requests work
An event describes something that has happened, such as PaymentAuthorized. A command asks a particular service to do something, such as AuthorizePayment. Naming and modeling that distinction helps consumers understand whether they are reacting to a fact or being asked to perform an action. Business rules and authoritative data should remain with the service responsible for them; consumers should not need to query the producer’s database directly.
Asynchronous communication changes coupling; it does not erase it
A broker can separate a producer from the immediate availability of its consumers, and several consumers can react independently. But the services still depend on shared meanings, payloads, delivery behavior, and operational processes. Microsoft’s Azure Architecture Center describes event-driven architectures as involving patterns such as competing consumers, stream processing, choreography, saga orchestration, and observability across decoupled components.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Which communication pattern fits the interaction?
Choose based on whether a caller needs an immediate answer, how work should be distributed, and whether consumers need retained history. A broker is not automatically the right choice for every service interaction.
| Pattern | Best fit | Key design consideration |
|---|---|---|
| Synchronous request and response | A caller needs an immediate result to continue, such as a validation or lookup. | The caller depends on the responding service’s availability and response time. Use timeouts and failure isolation for these remaining direct calls. |
| Event notification | Consumers need to know that a change occurred and can obtain any further details through an agreed interface. | Keep the event’s meaning clear; avoid making consumers depend on private producer data. |
| Event-carried state | Consumers need enough information in the event to act independently. | Design a stable payload that represents a business contract rather than exposing an internal database model. |
| Competing-consumer queue | A work item should be handled by one worker in a pool. | Confirm the platform’s delivery, ordering, and retry behavior; duplicate handling remains important. |
| Retained event stream | Multiple independent consumers or stream-processing applications need to read events, potentially at different rates or from retained history. | Retention, replay, consumer progress, ordering scope, and storage semantics depend on the platform and its configuration. |
These labels describe different patterns, not guarantees supplied by every broker. Before relying on replay, ordering, fan-out, or delivery semantics, verify how the selected platform implements them.
How to handle a business workflow across services
When each service owns a separate data store, do not assume one ACID transaction can cover the whole distributed workflow. Instead, each participant commits a local transaction and the workflow coordinates what happens next. Microsoft Learn’s Azure Architecture Center defines a saga as managing data consistency across microservices with independent data stores.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Model the saga as local work and business compensation
- Define the business outcome and the services that own each step and its data.
- For each step, specify the local transaction, the event or message that advances the workflow, and the failure conditions.
- Decide what should happen when a later step cannot complete. Design a compensating action for earlier effects where appropriate.
- Test successful paths, failures at each step, duplicate messages, and recovery or replay behavior.
Compensation is business logic, not necessarily a literal rollback. If an email has already been sent, for example, the remedy may be a correction rather than erasing the original message. The workflow must make that outcome explicit.
Choose choreography or orchestration deliberately
In choreography, participants react to events and publish further events without a central coordinator deciding every transition. This can keep participants independent, but a long workflow may become difficult to follow. In orchestration, a coordinator directs the sequence of actions, making the control flow easier to inspect but introducing a central workflow component. Azure’s saga guidance describes local transactions and compensating actions; AWS Prescriptive Guidance treats choreography and orchestration as distinct saga approaches. The choice depends on workflow complexity, visibility, ownership, and failure handling—not a universal rule that one style is better.
How to avoid losing a message between a database and a broker
A producer can commit a database change and then fail before publishing the corresponding message. The business state now says one thing while downstream consumers have not been told about it. A transactional outbox addresses this gap by recording both the business update and the event to publish in the same local database transaction.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
What the outbox does—and what it does not
A separate relay reads outbox records and publishes them to the broker. Because the relay may publish a record more than once, an outbox does not eliminate duplicate delivery or the need for duplicate-safe consumers. It is a reliability pattern, not a broker-specific guarantee. The service team also needs ownership for relay monitoring, recovery, outbox retention and cleanup, and event-schema evolution.
How to make event processing reliable
Design for the actual delivery and processing behavior of the broker and application. Do not promise end-to-end “exactly once” as a blanket property: a consumer can receive an event again, and failures can happen between processing and acknowledging work.
Make handlers idempotent
A handler is idempotent when processing the same event repeatedly does not repeat a non-idempotent business effect. Use stable event IDs and, where appropriate, durable deduplication records or idempotency keys. Microsoft’s event-sourcing guidance notes that consumer delivery is typically at least once, so duplicates are possible. Deduplication state must be durable enough for the relevant retry and replay window.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Set retry, dead-letter, and replay policies
- Retry transient failures with bounded policies and backoff; unbounded or aggressive retries can create retry storms.
- Define what happens when retries are exhausted, including where failed messages can be inspected and who owns that work.
- Make replay a supported procedure with controls, not an improvised action. Confirm whether replay can repeat side effects or change ordering.
- Document which failures are safe to retry and which require correction or human intervention.
Microsoft’s event-driven architecture guidance discusses competing consumers and observability; its microservices design-pattern guidance covers failure-handling patterns. The precise retry and dead-letter mechanisms remain platform-specific.
Scope ordering to the business requirement
Do not assume that all events arrive or are processed in one global order. If a workflow needs per-entity ordering, define the entity key—for example, an order ID—and verify that the chosen broker’s partitioning and delivery behavior preserve the required order for that key. Retries, recovery, and resubmission can still affect processing order.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Event streaming is not event sourcing
Event streaming distributes events to consumers and can support stream processing or retained reads. Event sourcing is a persistence model: it stores state changes as an append-only sequence from which current state or projections can be derived. A system can use a stream or broker without making that broker its authoritative event store.
Recommended Free Tools
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Event sourcing may support audit and replay requirements, but it also makes schema evolution, projection rebuilding, retention, privacy, and recovery part of the design. Microsoft’s Azure Architecture Center notes that Kafka can distribute events to projections and external consumers, but is not a substitute for an event store when per-entity stream queries and optimistic concurrency are required. Adopt event sourcing only when durable event history and replay are actual requirements.
What to monitor across asynchronous boundaries
A request trace may no longer show the full path once work crosses a broker and is handled later. Standardize correlation identifiers and propagate trace context where supported so an event can be connected to its originating action and downstream work. Monitor logs, metrics, traces, consumer lag, failures, retry activity, and replay behavior across service boundaries.
AWS’s 2023 Architecture Blog guidance recommends decentralized ownership of event-driven components alongside centrally standardized logging and observability practices. This pairing gives service teams responsibility for their components without making cross-service diagnosis depend on incompatible telemetry conventions.
Design questions to answer before adopting the pattern
- Interaction: Does the caller need an immediate answer, or can the result arrive asynchronously?
- Consistency: Is a local transaction sufficient, or does the business workflow cross service-owned data stores and require a saga?
- Delivery and replay: Are duplicates safe? Must events be retained or replayed? Is the need work distribution or stream processing?
- Ordering and latency: Which entity requires ordered processing, and how much delay is acceptable?
- Operations: Can the team operate the broker, event schemas, retries, dead letters, consumer lag, and distributed tracing?
- Ownership and evolution: Who owns each event contract, data boundary, compatibility policy, and process for discovering and changing consumers?
- Security and lifecycle: What access controls, sensitive-data handling, retention, and replay policies apply in this deployment?
These questions reflect concerns addressed in Microsoft’s Azure Architecture Center guidance on event-driven architecture, sagas, event sourcing, and microservices readiness, as well as AWS architecture guidance. Specific regulatory obligations and platform guarantees depend on the deployment context.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteQuick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
