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/**
* Copyright 2014 Netflix, Inc.
*
* 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.netflix.config;
import com.google.common.base.Preconditions;
import org.apache.commons.configuration.AbstractConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.event.ConfigurationEvent;
import org.apache.commons.configuration.event.ConfigurationListener;
/**
* An implementation of {@link DeploymentContext} based on system wide configuration set with
* {@link ConfigurationManager}. All the getters will first consult corresponding property
* and return the value if set.
*
* @author awang
*/
public class ConfigurationBasedDeploymentContext extends SimpleDeploymentContext {
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#environment} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_ENVIRONMENT_PROPERTY = "archaius.deployment.environment";
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#datacenter} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_DATACENTER_PROPERTY = "archaius.deployment.datacenter";
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#appId} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_APPLICATION_ID_PROPERTY = "archaius.deployment.applicationId";
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#serverId} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_SERVER_ID_PROPERTY = "archaius.deployment.serverId";
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#stack} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_STACK_PROPERTY = "archaius.deployment.stack";
/**
* should use value from {@link ContextKey#getKey()} on {@link ContextKey#environment} as the property to set or get
*/
@Deprecated
public static final String DEPLOYMENT_REGION_PROPERTY = "archaius.deployment.region";
private ConfigurationListener configListener = new ConfigurationListener() {
@Override
public void configurationChanged(ConfigurationEvent event) {
if (event.isBeforeUpdate()
|| (event.getType() != AbstractConfiguration.EVENT_ADD_PROPERTY
&& event.getType() != AbstractConfiguration.EVENT_SET_PROPERTY)) {
return;
}
String name = event.getPropertyName();
String value = event.getPropertyValue() == null ? null : String.valueOf(event.getPropertyValue());
if (value == null) {
return;
}
if (name.equals(DEPLOYMENT_ENVIRONMENT_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setDeploymentRegion(value);
setValueInConfig(ContextKey.environment.getKey(), value);
} else if (name.equals(DEPLOYMENT_DATACENTER_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setDeploymentDatacenter(value);
setValueInConfig(ContextKey.datacenter.getKey(), value);
} else if (name.equals(DEPLOYMENT_STACK_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setDeploymentStack(value);
setValueInConfig(ContextKey.stack.getKey(), value);
} else if (name.equals(DEPLOYMENT_APPLICATION_ID_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setApplicationId(value);
setValueInConfig(ContextKey.appId.getKey(), value);
} else if (name.equals(DEPLOYMENT_REGION_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setDeploymentRegion(value);
setValueInConfig(ContextKey.region.getKey(), value);
} else if (name.equals(DEPLOYMENT_SERVER_ID_PROPERTY)) {
ConfigurationBasedDeploymentContext.super.setDeploymentServerId(value);
setValueInConfig(ContextKey.serverId.getKey(), value);
}
}
};
public ConfigurationBasedDeploymentContext() {
super();
AbstractConfiguration config = ConfigurationManager.getConfigInstance();
if (config != null) {
String contextValue = getValueFromConfig(DEPLOYMENT_APPLICATION_ID_PROPERTY);
if (contextValue != null) {
setApplicationId(contextValue);
}
contextValue = getValueFromConfig(DEPLOYMENT_DATACENTER_PROPERTY);
if (contextValue != null) {
setDeploymentDatacenter(contextValue);
}
contextValue = getValueFromConfig(DEPLOYMENT_ENVIRONMENT_PROPERTY);
if (contextValue != null) {
setDeploymentEnvironment(contextValue);
}
contextValue = getValueFromConfig(DEPLOYMENT_REGION_PROPERTY);
if (contextValue != null) {
setDeploymentRegion(contextValue);
}
contextValue = getValueFromConfig(DEPLOYMENT_STACK_PROPERTY);
if (contextValue != null) {
setDeploymentStack(contextValue);
}
contextValue = getValueFromConfig(DEPLOYMENT_SERVER_ID_PROPERTY);
if (contextValue != null) {
setDeploymentServerId(contextValue);
}
config.addConfigurationListener(configListener);
}
}
/**
* Get the deployment environment. If property "archaius.deployment.environment"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentEnvironment().
*/
@Override
public String getDeploymentEnvironment() {
String value = getValueFromConfig(DeploymentContext.ContextKey.environment.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_ENVIRONMENT_PROPERTY);
if (value != null) {
return value;
} else {
return super.getDeploymentEnvironment();
}
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setDeploymentEnvironment(String value) {
super.setDeploymentEnvironment(value);
setValueInConfig(DEPLOYMENT_ENVIRONMENT_PROPERTY, value);
setValueInConfig(ContextKey.environment.getKey(), value);
}
/**
* Get the deployment environment. If property "archaius.deployment.datacenter"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentDatacenter().
*/
@Override
public String getDeploymentDatacenter() {
String value = getValueFromConfig(DeploymentContext.ContextKey.datacenter.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_DATACENTER_PROPERTY);
}
if (value != null) {
return value;
} else {
return super.getDeploymentDatacenter();
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setDeploymentDatacenter(String value) {
super.setDeploymentDatacenter(value);
setValueInConfig(DEPLOYMENT_DATACENTER_PROPERTY, value);
setValueInConfig(ContextKey.datacenter.getKey(), value);
}
/**
* Get the deployment environment. If property "archaius.deployment.applicationId"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getApplicationId().
*/
@Override
public String getApplicationId() {
String value = getValueFromConfig(DeploymentContext.ContextKey.appId.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_APPLICATION_ID_PROPERTY);
}
if (value != null) {
return value;
} else {
return super.getApplicationId();
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setApplicationId(String value) {
super.setApplicationId(value);
setValueInConfig(DEPLOYMENT_APPLICATION_ID_PROPERTY, value);
setValueInConfig(ContextKey.appId.getKey(), value);
}
/**
* Get the deployment environment. If property "archaius.deployment.serverId"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentServerId().
*/
@Override
public String getDeploymentServerId() {
String value = getValueFromConfig(DeploymentContext.ContextKey.serverId.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_SERVER_ID_PROPERTY);
}
if (value != null) {
return value;
} else {
return super.getDeploymentServerId();
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setDeploymentServerId(String value) {
super.setDeploymentServerId(value);
setValueInConfig(DEPLOYMENT_SERVER_ID_PROPERTY, value);
setValueInConfig(ContextKey.serverId.getKey(), value);
}
/**
* Get the deployment environment. If property "archaius.deployment.stack"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentStack().
*/
@Override
public String getDeploymentStack() {
String value = getValueFromConfig(DeploymentContext.ContextKey.stack.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_STACK_PROPERTY);
}
if (value != null) {
return value;
} else {
return super.getDeploymentStack();
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setDeploymentStack(String value) {
super.setDeploymentStack(value);
setValueInConfig(DEPLOYMENT_STACK_PROPERTY, value);
setValueInConfig(ContextKey.stack.getKey(), value);
}
/**
* Get the deployment environment. If property "archaius.deployment.region"
* is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentRegion().
*/
@Override
public String getDeploymentRegion() {
String value = getValueFromConfig(DeploymentContext.ContextKey.region.getKey());
if (value != null) {
return value;
} else {
value = getValueFromConfig(DEPLOYMENT_REGION_PROPERTY);
}
if (value != null) {
return value;
} else {
return super.getDeploymentRegion();
}
}
/**
* Call super and also update the configuration to reflect the changes.
*
* @param value
*/
@Override
public void setDeploymentRegion(String value) {
super.setDeploymentRegion(value);
setValueInConfig(DEPLOYMENT_REGION_PROPERTY, value);
setValueInConfig(ContextKey.region.getKey(), value);
}
private String getValueFromConfig(String name) {
Configuration conf = ConfigurationManager.getConfigInstance();
if (conf == null) {
return null;
}
String value = (String) conf.getProperty(name);
if (value != null) {
return value;
} else {
value = System.getProperty(name);
if (value != null) {
return value;
}
}
return null;
}
private void setValueInConfig(String name, String value) {
Preconditions.checkNotNull(name);
Preconditions.checkNotNull(value);
ConfigurationManager.getConfigInstance().setProperty(name, value);
}
@Override
public String getValue(ContextKey key) {
String value = getValueFromConfig(key.getKey());
if (value != null) {
return value;
} else {
return super.getValue(key);
}
}
}
