The Black Charter of Oil & Gas: When Code Architecture Dictates Survival

┌────────────────────────────────────────────────────────┐
│             OIL & GAS PRODUCTION CONTRACT              │
│       (Closed for Modification - Constitutional)       │
├────────────────────────────────────────────────────────┤
│  + streamGasAndOil() : TelemetryPack                   │
│  + triggerEmergencyShutdown() : void                   │
└────────────────────────────────────────────────────────┘

package domain.contract;

/**
 * THE OIL & GAS CONSTITUTION: Strictly closed for modification once signed.
 * Any change here will destroy the integrity of the entire ecosystem.
 */
public interface WellExplorationContract {
    
    // Raw data stream (Pressure, Temperature, Gas Density) transmitted to the center
    WellTelemetry readLiveTelemetry();
    
    // Emergency command: Instantly shut down the well when geological anomalies occur
    void executeEmergencyShutdown();
}

package infrastructure.tools;

import domain.contract.WellExplorationContract;
import domain.contract.WellTelemetry;

public class RotarySteeringTool implements WellExplorationContract {
    
    @Override
    public WellTelemetry readLiveTelemetry() {
        // Measurement While Drilling (MWD) algorithm
        double pressure = calculateSubsurfacePressure(); 
        return new WellTelemetry(pressure, 120.5, "GAS_EXPULSION");
    }

    @Override
    public void executeEmergencyShutdown() {
        System.out.println("🚨 [Rotary Tool] Activating mechanical isolation valve at the subsurface drill bit!");
    }

    private double calculateSubsurfacePressure() {
        return 4200.0; // PSI
    }
}

package infrastructure.tools;

import domain.contract.WellExplorationContract;
import domain.contract.WellTelemetry;

public class DeepwaterRovTool implements WellExplorationContract {

    @Override
    public WellTelemetry readLiveTelemetry() {
        // Receiving sonar signals and hydraulic sensor data from the ocean floor
        return new WellTelemetry(8500.0, 4.0, "CRUDE_OIL_HEAVY");
    }

    @Override
    public void executeEmergencyShutdown() {
        System.out.println("⚡ [ROV Critical] Issuing emergency hydraulic closure command to the seabed Christmas Tree (Xmas Tree)!");
    }
}

package di;

import dagger.Module;
import dagger.Provides;
import domain.contract.WellExplorationContract;
import infrastructure.tools.DeepwaterRovTool;
import infrastructure.tools.RotarySteeringTool;

@Module
public class OffshoreExplorationModule {
    
    private final String environmentType;

    public OffshoreExplorationModule(String environmentType) {
        this.environmentType = environmentType;
    }

    @Provides
    public WellExplorationContract provideExplorationStrategy() {
        // Strategic decisions are made at the Configuration Layer
        if ("DEEP_WATER".equals(environmentType)) {
            return new DeepwaterRovTool(); // Appointing the Deepwater ROV
        }
        return new RotarySteeringTool(); // Appointing the Onshore/Subsurface Drill Bit
    }
}

package di;

import dagger.Component;
import core.OilRigControlRoom;

@Component(modules = OffshoreExplorationModule.class)
public interface RigEcosystemComponent {
    void injectToControlRoom(OilRigControlRoom controlRoom);
}

package core;

import domain.contract.WellExplorationContract;
import domain.contract.WellTelemetry;
import javax.inject.Inject;

public class OilRigControlRoom {

    // Dependency Inversion. 
    // The control room only trusts the supreme Contract.
    @Inject
    WellExplorationContract contractStrategy;

    public void monitorProductionLifecycle() {
        System.out.println("🎬 [SYSTEM] Starting oil and gas flow monitoring cycle...");

        // 1. Read field data via interface
        WellTelemetry telemetry = contractStrategy.readLiveTelemetry();
        System.out.printf("📊 [TELEMETRY] Well Pressure: %.2f PSI | Fluid Status: %s\n", 
                telemetry.getPressurePsi(), telemetry.getFluidType());

        // 2. Core automated safety handling logic
        if (telemetry.getPressurePsi() > 8000.0) {
            System.out.println("🛑 [CRITICAL] Pressure has severely breached the safety threshold!");
            contractStrategy.executeEmergencyShutdown(); // Triggering the polymorphic well closure mechanism
        } else {
            System.out.println("✅ [OK] Flow is within limits. Production progress is stable.");
        }
    }
}

import core.OilRigControlRoom;
import di.DaggerRigEcosystemComponent;
import di.OffshoreExplorationModule;

public class OilFieldApplication {
    public static void main(String[] args) {
        // Simulating context: The rig is towed out to an ultra-deepwater field
        String currentFieldCondition = "DEEP_WATER";

        OilRigControlRoom controlRoom = new OilRigControlRoom();

        // The Dagger 2 engine automatically assembles the system based on the environmental configuration
        DaggerRigEcosystemComponent.builder()
                .offshoreExplorationModule(new OffshoreExplorationModule(currentFieldCondition))
                .build()
                .injectToControlRoom(controlRoom);

        // Operate the rig
        controlRoom.monitorProductionLifecycle();
    }
}