src/main/java/com/aliyun/oss/common/auth/CustomSessionCredentialsProvider.java [35:51]:
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        this.fetcher = fetcher;
        return this;
    }

    @Override
    public void setCredentials(Credentials creds) {

    }

    @Override
    public Credentials getCredentials() {        
        if (credentials == null || credentials.willSoonExpire()) {
            synchronized (this) {
                if (credentials == null || credentials.willSoonExpire()) {
                    try {
                        credentials = (BasicCredentials) fetcher.fetch(maxRetryTimes);
                    } catch (ClientException e) {
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src/main/java/com/aliyun/oss/common/auth/EcsRamRoleCredentialsProvider.java [33:49]:
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        this.fetcher = fetcher;
        return this;
    }

    @Override
    public void setCredentials(Credentials creds) {

    }

    @Override
    public Credentials getCredentials() {        
        if (credentials == null || credentials.willSoonExpire()) {
            synchronized (this) {
                if (credentials == null || credentials.willSoonExpire()) {
                    try {
                        credentials = (BasicCredentials) fetcher.fetch(maxRetryTimes);
                    } catch (ClientException e) {
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