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类全路径: org.springframework.core.env.AbstractEnvironment
类图
下面将介绍AbstractEnvironment的属性
/**
* System property that instructs Spring to ignore system environment variables,
* i.e. to never attempt to retrieve such a variable via {@link System#getenv()}.
* <p>The default is "false", falling back to system environment variable checks if a
* Spring environment property (e.g. a placeholder in a configuration String) isn't
* resolvable otherwise. Consider switching this flag to "true" if you experience
* log warnings from {@code getenv} calls coming from Spring, e.g. on WebSphere
* with strict SecurityManager settings and AccessControlExceptions warnings.
*
* Spring 忽略的系统变量
* @see #suppressGetenvAccess()
*/
public static final String IGNORE_GETENV_PROPERTY_NAME = "spring.getenv.ignore";
/**
* Name of property to set to specify active profiles: {@value}. Value may be comma
* delimited.
* <p>Note that certain shell environments such as Bash disallow the use of the period
* character in variable names. Assuming that Spring's {@link SystemEnvironmentPropertySource}
* is in use, this property may be specified as an environment variable as
* {@code SPRING_PROFILES_ACTIVE}.
* @see ConfigurableEnvironment#setActiveProfiles
*/
public static final String ACTIVE_PROFILES_PROPERTY_NAME = "spring.profiles.active";
/**
* Name of property to set to specify profiles active by default: {@value}. Value may
* be comma delimited.
* <p>Note that certain shell environments such as Bash disallow the use of the period
* character in variable names. Assuming that Spring's {@link SystemEnvironmentPropertySource}
* is in use, this property may be specified as an environment variable as
* {@code SPRING_PROFILES_DEFAULT}.
* @see ConfigurableEnvironment#setDefaultProfiles
*/
public static final String DEFAULT_PROFILES_PROPERTY_NAME = "spring.profiles.default";
/**
* Name of reserved default profile name: {@value}. If no default profile names are
* explicitly and no active profile names are explicitly set, this profile will
* automatically be activated by default.
* @see #getReservedDefaultProfiles
* @see ConfigurableEnvironment#setDefaultProfiles
* @see ConfigurableEnvironment#setActiveProfiles
* @see AbstractEnvironment#DEFAULT_PROFILES_PROPERTY_NAME
* @see AbstractEnvironment#ACTIVE_PROFILES_PROPERTY_NAME
*/
protected static final String RESERVED_DEFAULT_PROFILE_NAME = "default";
protected final Log logger = LogFactory.getLog(getClass());
/**
* 激活的 profile
*/
private final Set<String> activeProfiles = new LinkedHashSet<>();
/**
* 默认的 profile
*/
private final Set<String> defaultProfiles = new LinkedHashSet<>(getReservedDefaultProfiles());
/**
* 属性源集合
*/
private final MutablePropertySources propertySources = new MutablePropertySources();
protected void customizePropertySources(MutablePropertySources propertySources) {
}
抽象方法
获取默认的 profile 名称
protected Set<String> getReservedDefaultProfiles() {
return Collections.singleton(RESERVED_DEFAULT_PROFILE_NAME);
}
public String[] getActiveProfiles() {
return StringUtils.toStringArray(doGetActiveProfiles());
}
protected Set<String> doGetActiveProfiles() {
synchronized (this.activeProfiles) {
if (this.activeProfiles.isEmpty()) {
// 通过 PropertySourcesPropertyResolver 获取prfiles
String profiles = getProperty(ACTIVE_PROFILES_PROPERTY_NAME);
if (StringUtils.hasText(profiles)) {
// 设置 profile
// 1. 按照逗号切分
// 2. 设置
setActiveProfiles(StringUtils.commaDelimitedListToStringArray(
StringUtils.trimAllWhitespace(profiles)));
}
}
return this.activeProfiles;
}
}
@Override
public void setActiveProfiles(String... profiles) {
Assert.notNull(profiles, "Profile array must not be null");
if (logger.isDebugEnabled()) {
logger.debug("Activating profiles " + Arrays.asList(profiles));
}
synchronized (this.activeProfiles) {
this.activeProfiles.clear();
for (String profile : profiles) {
// profile 验证
validateProfile(profile);
this.activeProfiles.add(profile);
}
}
}
protected void validateProfile(String profile) {
// 是否存在
if (!StringUtils.hasText(profile)) {
throw new IllegalArgumentException("Invalid profile [" + profile + "]: must contain text");
}
// 是否有 !
if (profile.charAt(0) == '!') {
throw new IllegalArgumentException("Invalid profile [" + profile + "]: must not begin with ! operator");
}
}
@Override
public void addActiveProfile(String profile) {
if (logger.isDebugEnabled()) {
logger.debug("Activating profile '" + profile + "'");
}
// 验证
validateProfile(profile);
// 设置 profile
doGetActiveProfiles();
synchronized (this.activeProfiles) {
// 添加 profile
this.activeProfiles.add(profile);
}
}
@Override
public String[] getDefaultProfiles() {
return StringUtils.toStringArray(doGetDefaultProfiles());
}
protected Set<String> doGetDefaultProfiles() {
synchronized (this.defaultProfiles) {
// 1. 获取默认的 profile
if (this.defaultProfiles.equals(getReservedDefaultProfiles())) {
String profiles = getProperty(DEFAULT_PROFILES_PROPERTY_NAME);
if (StringUtils.hasText(profiles)) {
// 设置默认的 profile
setDefaultProfiles(StringUtils.commaDelimitedListToStringArray(
StringUtils.trimAllWhitespace(profiles)));
}
}
return this.defaultProfiles;
}
}
@Override
public void setDefaultProfiles(String... profiles) {
Assert.notNull(profiles, "Profile array must not be null");
synchronized (this.defaultProfiles) {
this.defaultProfiles.clear();
for (String profile : profiles) {
// 验证
validateProfile(profile);
this.defaultProfiles.add(profile);
}
}
}
@Override
@Deprecated
public boolean acceptsProfiles(String... profiles) {
Assert.notEmpty(profiles, "Must specify at least one profile");
for (String profile : profiles) {
if (StringUtils.hasLength(profile) && profile.charAt(0) == '!') {
// 判断是否激活
if (!isProfileActive(profile.substring(1))) {
return true;
}
}
else if (isProfileActive(profile)) {
return true;
}
}
return false;
}
protected boolean isProfileActive(String profile) {
validateProfile(profile);
// 当前激活的profile
Set<String> currentActiveProfiles = doGetActiveProfiles();
// 当前激活的profile 中是否包含 参数profile
// 当前激活的 profile 是否为空
// 当前激活的profile 中是否包含 参数profile
return (currentActiveProfiles.contains(profile) ||
(currentActiveProfiles.isEmpty() && doGetDefaultProfiles().contains(profile)));
}
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public Map<String, Object> getSystemProperties() {
try {
// 获取系统属性
return (Map) System.getProperties();
}
catch (AccessControlException ex) {
return (Map) new ReadOnlySystemAttributesMap() {
@Override
@Nullable
protected String getSystemAttribute(String attributeName) {
try {
// 获取系统属性
return System.getProperty(attributeName);
}
catch (AccessControlException ex) {
if (logger.isInfoEnabled()) {
logger.info("Caught AccessControlException when accessing system property '" +
attributeName + "'; its value will be returned [null]. Reason: " + ex.getMessage());
}
return null;
}
}
};
}
}
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public Map<String, Object> getSystemEnvironment() {
if (suppressGetenvAccess()) {
return Collections.emptyMap();
}
try {
return (Map) System.getenv();
}
catch (AccessControlException ex) {
return (Map) new ReadOnlySystemAttributesMap() {
@Override
@Nullable
protected String getSystemAttribute(String attributeName) {
try {
return System.getenv(attributeName);
}
catch (AccessControlException ex) {
if (logger.isInfoEnabled()) {
logger.info("Caught AccessControlException when accessing system environment variable '" +
attributeName + "'; its value will be returned [null]. Reason: " + ex.getMessage());
}
return null;
}
}
};
}
}
protected boolean suppressGetenvAccess() {
// 读取spring中spring.getenv.ignore的属性
return SpringProperties.getFlag(IGNORE_GETENV_PROPERTY_NAME);
}
@Override
public void merge(ConfigurableEnvironment parent) {
for (PropertySource<?> ps : parent.getPropertySources()) {
if (!this.propertySources.contains(ps.getName())) {
this.propertySources.addLast(ps);
}
}
String[] parentActiveProfiles = parent.getActiveProfiles();
if (!ObjectUtils.isEmpty(parentActiveProfiles)) {
synchronized (this.activeProfiles) {
Collections.addAll(this.activeProfiles, parentActiveProfiles);
}
}
String[] parentDefaultProfiles = parent.getDefaultProfiles();
if (!ObjectUtils.isEmpty(parentDefaultProfiles)) {
synchronized (this.defaultProfiles) {
this.defaultProfiles.remove(RESERVED_DEFAULT_PROFILE_NAME);
Collections.addAll(this.defaultProfiles, parentDefaultProfiles);
}
}
}
ConfigurablePropertyResolver接口做处理.此处可能存在不合适展示的内容，页面不予展示。您可通过相关编辑功能自查并修改。
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