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The AWS SDK for Java - Core module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.

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/*
 * Copyright 2010-2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.monitoring;

import com.amazonaws.SdkClientException;
import com.amazonaws.annotation.ThreadSafe;

import static com.amazonaws.SDKGlobalConfiguration.AWS_CSM_CLIENT_ID_ENV_VAR;
import static com.amazonaws.SDKGlobalConfiguration.AWS_CSM_ENABLED_ENV_VAR;
import static com.amazonaws.SDKGlobalConfiguration.AWS_CSM_HOST_ENV_VAR;
import static com.amazonaws.SDKGlobalConfiguration.AWS_CSM_PORT_ENV_VAR;
import static com.amazonaws.SDKGlobalConfiguration.DEFAULT_AWS_CSM_CLIENT_ID;
import static com.amazonaws.SDKGlobalConfiguration.DEFAULT_AWS_CSM_PORT;
import static com.amazonaws.SDKGlobalConfiguration.DEFAULT_AWS_CSM_HOST;

/**
 * Configuration provider that sources the client side monitoring
 * configuration parameters from environment variables.
 *
 * @see com.amazonaws.SDKGlobalConfiguration#AWS_CSM_CLIENT_ID_ENV_VAR
 * @see com.amazonaws.SDKGlobalConfiguration#AWS_CSM_ENABLED_ENV_VAR
 * @see com.amazonaws.SDKGlobalConfiguration#AWS_CSM_PORT_ENV_VAR
 */
@ThreadSafe
public final class EnvironmentVariableCsmConfigurationProvider implements CsmConfigurationProvider {
    @Override
    public CsmConfiguration getConfiguration() {
        String enabled = System.getenv(AWS_CSM_ENABLED_ENV_VAR);

        if (enabled == null) {
            throw new SdkClientException("Unable to load Client Side Monitoring configurations from"
                                         + " environment variables!");
        }

        String host = System.getenv(AWS_CSM_HOST_ENV_VAR);
        host = host == null ? DEFAULT_AWS_CSM_HOST : host;
        String port = System.getenv(AWS_CSM_PORT_ENV_VAR);
        String clientId = System.getenv(AWS_CSM_CLIENT_ID_ENV_VAR);
        clientId = clientId == null ? DEFAULT_AWS_CSM_CLIENT_ID : clientId;

        try {
            int portNumber = port == null ? DEFAULT_AWS_CSM_PORT : Integer.parseInt(port);
            return CsmConfiguration.builder()
                    .withEnabled(Boolean.parseBoolean(enabled))
                    .withHost(host)
                    .withPort(portNumber)
                    .withClientId(clientId)
                    .build();
        } catch (Exception e) {
            throw new SdkClientException("Unable to load Client Side Monitoring configurations from"
                    + " environment variables!", e);
        }
    }
}