pl.allegro.tech.hermes.infrastructure.dc.EnvironmentVariableDatacenterNameProvider Maven / Gradle / Ivy

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Fast and reliable message broker built on top of Kafka.

There is a newer version: 2.7.0

package pl.allegro.tech.hermes.infrastructure.dc;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EnvironmentVariableDatacenterNameProvider implements DatacenterNameProvider {
    private static final Logger logger = LoggerFactory.getLogger(EnvironmentVariableDatacenterNameProvider.class);

    private final String variableName;

    public EnvironmentVariableDatacenterNameProvider(String variableName) {
        this.variableName = variableName;
    }

    @Override
    public String getDatacenterName() {
        String dcName = System.getenv(variableName);
        if (dcName == null) {
            logger.info("Undefined environment variable: " + variableName);
            throw new DcNameProvisionException("Undefined environment variable: " + variableName);
        }
        logger.info("Providing DC name from environment variable: {}={}", variableName, dcName);
        return dcName;
    }
}