adpa-enterprise-framework-automation/dist/utils/circuit-breaker.js

Modular, standards-compliant Node.js/TypeScript automation framework for enterprise requirements, project, and data management. Provides CLI and API for BABOK v3, PMBOK 7th Edition, and DMBOK 2.0 (in progress). Production-ready Express.js API with TypeSpe

/**
 * Circuit Breaker Pattern Implementation
 * Provides fault tolerance and resilience for external service calls
 */
export class CircuitBreaker {
    state = 'CLOSED';
    failureCount = 0;
    lastFailureTime = null;
    config;
    constructor(config) {
        this.config = config;
    }
    async execute(operation) {
        if (this.state === 'OPEN') {
            if (this.shouldAttemptReset()) {
                this.state = 'HALF_OPEN';
                this.notifyStateChange();
            }
            else {
                throw new Error('Circuit breaker is OPEN');
            }
        }
        try {
            const result = await operation();
            this.onSuccess();
            return result;
        }
        catch (error) {
            this.onFailure();
            throw error;
        }
    }
    onSuccess() {
        this.failureCount = 0;
        this.lastFailureTime = null;
        this.state = 'CLOSED';
        this.notifyStateChange();
    }
    onFailure() {
        this.failureCount++;
        this.lastFailureTime = Date.now();
        if (this.failureCount >= this.config.failureThreshold) {
            this.state = 'OPEN';
            this.notifyStateChange();
        }
    }
    shouldAttemptReset() {
        return this.lastFailureTime !== null &&
            (Date.now() - this.lastFailureTime) >= this.config.resetTimeout;
    }
    notifyStateChange() {
        if (this.config.monitor) {
            this.config.monitor(this.state);
        }
    }
    getState() {
        return this.state;
    }
    getFailureCount() {
        return this.failureCount;
    }
}
// Legacy compatibility export
export const circuitBreaker = new CircuitBreaker({
    failureThreshold: 5,
    resetTimeout: 60000
});
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