Pull model
A pull model is a pattern in which a consumer or recipient initiates requests for data, messages, configuration, or work according to its needs or readiness.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
A pull model is an automation pattern in which managed systems periodically connect to a management system and retrieve configuration.
- How it is used
- Contrasts client-initiated configuration retrieval with server-initiated automation in infrastructure as code.
- How deep it goes
- Defines request direction, agent architecture, workload distribution, and update delays, but does not detail agent implementation.
- Examples
- Uses Puppet and Chef agents retrieving configurations from central servers, contrasted with Ansible and Terraform push workflows.
- What you can do after
- Evaluate whether distributed check-ins or centralized immediate updates better suit an organization and network.
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The Joy of JavaScript
A communication or data-flow model in which a consumer requests data when it needs it.
- How it is used
- Frames consumer-initiated data access and contrasts it with producer-controlled push communication.
- How deep it goes
- Defines producer-consumer control and demonstrates functions, iterator next calls, arrays, and polling, without implementing a standalone pull abstraction.
- Examples
- Uses function calls, iterator next calls, array indexing, Symbol.iterator, and interval-based long polling as concrete pull examples.
- What you can do after
- Apply it via JavaScript functions, iterators, and array access when consumers should control when data is requested.
Spring in Action, Sixth Edition
A pull model is a messaging consumption pattern in which a consumer explicitly requests or retrieves messages, potentially waiting until one is available.
- How it is used
- Controls when a consumer requests and processes messages from a broker.
- How deep it goes
- Explains blocking retrieval, destination choices, and conversion, but stops short of broader listener implementation details.
- Examples
- Uses TacoOrder messages pulled from the tacocloud.order.queue destination with receive or receiveAndConvert.
- What you can do after
- Operate/configure a JMS consumer that retrieves raw messages or converted domain objects through JmsTemplate.
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Learn Docker in a Month of Lunches, Second Edition
A pull model is a data-collection approach in which a monitoring system periodically fetches data from monitored systems.
- How it is used
- Uses periodic scraping to collect application metrics from containerized services.
- How deep it goes
- Explains scraping configuration, target discovery, intervals, and scaling caveats without detailing Prometheus internals.
- Examples
- Uses a Prometheus YAML configuration, scaled access-log containers, generated HTTP requests, and a PromQL aggregation.
- What you can do after
- Operate/configure Prometheus jobs that scrape fixed or DNS-discovered containers and verify collected metrics.
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Related concepts
- Prometheusused by · Prometheus is an open-source monitoring and alerting system that collects, stores, and queries time-series metrics.
- streamingused by · Streaming is the incremental handling of a sequence of data items, including their processing, transfer, or consumption as they become available.
- YAGNI principleincludes · The YAGNI principle is a software design discipline of avoiding functionality or structure until a concrete need for it arises.
- push modelcontrasts with · A push model is a communication pattern in which a producer or system proactively sends data, work, or updates to recipients rather than waiting for each to request them.
- JmsTemplateused by · JmsTemplate is a Spring API that simplifies JMS message production and consumption by managing messaging boilerplate and exceptions.
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