com.github.cafapi.common.bootstrapconfigs.system.SystemBootstrapConfiguration Maven / Gradle / Ivy

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/*
 * Copyright 2015-2024 Open Text.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.cafapi.common.bootstrapconfigs.system;

import com.github.cafapi.common.api.BootstrapConfiguration;
import com.github.cafapi.common.api.ConfigurationException;
import com.github.cafapi.common.util.naming.ServicePath;

import javax.naming.InvalidNameException;
import java.util.Objects;

/**
 * Provides bootstrap configuration from Java system properties and environment variables. Note that system properties will always
 * override if present.
 */
public class SystemBootstrapConfiguration implements BootstrapConfiguration
{
    public static final String ENV_MARATHON_APP_ID = "MARATHON_APP_ID";

    @Override
    public boolean isConfigurationPresent(final String key)
    {
        return getProp(key) != null;
    }

    @Override
    public String getConfiguration(final String key)
        throws ConfigurationException
    {
        String ret = getProp(key);
        if (ret == null) {
            throw new ConfigurationException("Configuration parameter not found: " + key);
        }
        return ret;
    }

    @Override
    public int getConfigurationInteger(final String key)
        throws ConfigurationException
    {
        try {
            return Integer.parseInt(getConfiguration(key));
        } catch (final NumberFormatException e) {
            throw new ConfigurationException("Configuration value is not an integer: " + key, e);
        }
    }

    @Override
    public int getConfigurationInteger(final String key, final int min, final int max)
        throws ConfigurationException
    {
        return Math.max(min, Math.min(max, getConfigurationInteger(key)));
    }

    @Override
    public boolean getConfigurationBoolean(final String key)
        throws ConfigurationException
    {
        return Boolean.parseBoolean(getConfiguration(key));
    }

    @Override
    public ServicePath getServicePath()
        throws ConfigurationException
    {
        ServicePath path;
        try {
            if (isConfigurationPresent(BootstrapConfiguration.CONFIG_APP_NAME)) {
                path = new ServicePath(getConfiguration(BootstrapConfiguration.CONFIG_APP_NAME));
            } else if (isConfigurationPresent(BootstrapConfiguration.OLD_CONFIG_APP_NAME)) {
                path = new ServicePath(getConfiguration(BootstrapConfiguration.OLD_CONFIG_APP_NAME));
            } else {
                path = new ServicePath(getConfiguration(ENV_MARATHON_APP_ID));
            }
        } catch (final InvalidNameException e) {
            throw new ConfigurationException("Cannot get service path", e);
        }
        return path;
    }

    private String getProp(final String key)
    {
        Objects.requireNonNull(key);
        return System.getProperty(key, System.getenv(key));
    }
}