Example usage for com.fasterxml.jackson.core JsonGenerator flush

Introduction

In this page you can find the example usage for com.fasterxml.jackson.core JsonGenerator flush.

Prototype

@Override
public abstract void flush() throws IOException;

Source Link

Document

Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.

Usage

From source file:io.apiman.manager.ui.server.servlets.ConfigurationServlet.java

/**
 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
 *      javax.servlet.http.HttpServletResponse)
 *///  www  . j  ava2 s.c om
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    try {
        Class.forName("io.apiman.manager.ui.server.UIConfig"); //$NON-NLS-1$
    } catch (Throwable t) {
        t.printStackTrace();
    }

    JsonGenerator g = null;
    try {
        response.getOutputStream().write("window.APIMAN_CONFIG_DATA = ".getBytes("UTF-8")); //$NON-NLS-1$ //$NON-NLS-2$
        JsonFactory f = new JsonFactory();
        g = f.createGenerator(response.getOutputStream(), JsonEncoding.UTF8);
        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(Include.NON_NULL);
        g.setCodec(mapper);
        g.useDefaultPrettyPrinter();

        // Get data from various sources.
        String endpoint = getConfig().getManagementApiEndpoint();
        if (endpoint == null) {
            endpoint = getDefaultEndpoint(request);
        }
        UIVersion version = UIVersion.get();
        ApiAuthType authType = getConfig().getManagementApiAuthType();

        ConfigurationBean configBean = new ConfigurationBean();
        configBean.setApiman(new AppConfigurationBean());
        configBean.setUser(new UserConfigurationBean());
        configBean.setUi(new UiConfigurationBean());
        configBean.setApi(new ApiConfigurationBean());
        configBean.getUi().setHeader("community"); //$NON-NLS-1$
        configBean.getUi().setMetrics(getConfig().isMetricsEnabled());
        configBean.getUi().setPlatform(getConfig().getPlatform());
        configBean.getApiman().setVersion(version.getVersionString());
        configBean.getApiman().setBuiltOn(version.getVersionDate());
        configBean.getApiman().setLogoutUrl(getConfig().getLogoutUrl());
        configBean.getUser().setUsername(request.getRemoteUser());
        configBean.getApi().setEndpoint(endpoint);
        configBean.getApi().setAuth(new ApiAuthConfigurationBean());
        switch (authType) {
        case authToken: {
            configBean.getApi().getAuth().setType(ApiAuthType.authToken);
            String tokenGeneratorClassName = getConfig().getManagementApiAuthTokenGenerator();
            if (tokenGeneratorClassName == null) {
                throw new ServletException("No token generator class specified."); //$NON-NLS-1$
            }
            Class<?> c = Class.forName(tokenGeneratorClassName);
            ITokenGenerator tokenGenerator = (ITokenGenerator) c.newInstance();
            configBean.getApi().getAuth().setBearerToken(tokenGenerator.generateToken(request));
            break;
        }
        case basic: {
            configBean.getApi().getAuth().setType(ApiAuthType.basic);
            configBean.getApi().getAuth().setBasic(new BasicAuthCredentialsBean());
            String username = getConfig().getManagementApiAuthUsername();
            String password = getConfig().getManagementApiAuthPassword();
            configBean.getApi().getAuth().getBasic().setUsername(username);
            configBean.getApi().getAuth().getBasic().setPassword(password);
            break;
        }
        case bearerToken: {
            configBean.getApi().getAuth().setType(ApiAuthType.bearerToken);
            String tokenGeneratorClassName = getConfig().getManagementApiAuthTokenGenerator();
            if (tokenGeneratorClassName == null)
                throw new ServletException("No token generator class specified."); //$NON-NLS-1$
            Class<?> c = Class.forName(tokenGeneratorClassName);
            ITokenGenerator tokenGenerator = (ITokenGenerator) c.newInstance();
            configBean.getApi().getAuth().setBearerToken(tokenGenerator.generateToken(request));
            break;
        }
        case samlBearerToken: {
            configBean.getApi().getAuth().setType(ApiAuthType.samlBearerToken);
            String tokenGeneratorClassName = getConfig().getManagementApiAuthTokenGenerator();
            if (tokenGeneratorClassName == null)
                throw new ServletException("No token generator class specified."); //$NON-NLS-1$
            Class<?> c = Class.forName(tokenGeneratorClassName);
            ITokenGenerator tokenGenerator = (ITokenGenerator) c.newInstance();
            configBean.getApi().getAuth().setBearerToken(tokenGenerator.generateToken(request));
            break;
        }
        }
        g.writeObject(configBean);

        g.flush();
        response.getOutputStream().write(";".getBytes("UTF-8")); //$NON-NLS-1$ //$NON-NLS-2$
    } catch (Exception e) {
        throw new ServletException(e);
    } finally {
        IOUtils.closeQuietly(g);
    }
}