Example usage for com.fasterxml.jackson.databind MappingIterator close

Introduction

In this page you can find the example usage for com.fasterxml.jackson.databind MappingIterator close.

Prototype

@Override
    public void close() throws IOException

Source Link

Usage

From source file:org.hexlogic.model.DockerNode.java

@VsoMethod(showInApi = true, name = "pullImage", description = "Pull the image matching the given string from the docker hub repository, saving it on the docker host.")
public String pullImage(String imageName) throws Exception {
    log.debug("Pulling image '" + imageName + "'...");

    @SuppressWarnings("rawtypes")
    MappingIterator<Map> it = null;
    try {//from w w  w  .j av a2s .c om
        configureNode();
        DockerClient dockerClient = DockerClientBuilder.getInstance(config).build();
        log.debug("Starting pull operation...");

        /*
         * We will check the final result by comparing the initial image id, which is the first ID provided by the stream such as:
         * 
         * {status=Pulling image (latest) from dockerfile/nodejs, progressDetail={}, id=406eb4a4dcad}
         * 
         * to the image id of the last entity which owns id AND status which will look something like:
         * {status=Download complete, progressDetail={}, id=406eb4a4dcad}
         * 
         * If both IDs match, we know that the latest layer is the same as the requested image layer.
         * So the next step is to compare the download status of that layer
         */
        String firstId = null;
        String lastId = "";
        String lastStatus = "undefined";

        /*
         * In addition to the download status of the layer, we provide additional information about how the process went by
         * returning information to the user using the last entity which has no id and only a status, which looks like this:
         * {status=Status: Image is up to date for dockerfile/nodejs}
         * or
         * {status=Status: Downloaded newer image for dockerfile/nodejs}
         * or
         * {status=Repository dockerfile/nodejs already being pulled by another client. Waiting.}
         */
        String finalStatus = "undefined";

        for (it = new ObjectMapper().readValues(
                new JsonFactory().createJsonParser(dockerClient.pullImageCmd(imageName).exec()), Map.class); it
                        .hasNext();) {
            Map<?, ?> element = it.next();
            String id = "";
            String status = "";
            String progress = "";

            // info OUTPUT
            // log.debug("info: " + element);

            try {
                id = element.get("id").toString();
            } catch (NullPointerException e) {/* catch exception if key was not found */
            }
            try {
                status = element.get("status").toString();
            } catch (NullPointerException e) {/* catch exception if key was not found */
            }
            try {
                progress = element.get("progress").toString();
            } catch (NullPointerException e) {/* catch exception if key was not found */
            }

            // if the key was found and we got some status
            if (!id.isEmpty() && !status.isEmpty()) {
                // remember the first id of the output stream, which is the id of the image we want to pull
                if (firstId == null) {
                    log.debug("Remembering first id: " + id);
                    firstId = id;
                }

                // if the same layer is returned multiple times in a row, don't log everything but just the progress
                if (id.equals(lastId)) {
                    lastId = id;
                    lastStatus = status;
                    if (!progress.isEmpty()) {
                        log.debug("Progress: " + progress);
                    }
                } else {
                    lastId = id;
                    log.debug("Image '" + id + "' status is: " + status + ".");
                    if (!progress.isEmpty()) {
                        log.debug("Progress: " + progress);
                    }
                }
            }

            if (!status.isEmpty()) {
                finalStatus = status;
            }
        }

        // TODO find a more robust way to handle downloadStatus and finalStatus
        String downloadStatus = "undefined";
        if (lastId.equals(firstId)) {
            log.debug("Last download layer id does match the requested image id: " + firstId);
            if (StringUtils.containsIgnoreCase(lastStatus, "Download complete")) {
                downloadStatus = "successed";
                log.debug("The requested layer was downloaded successfuly.");
            } else {
                downloadStatus = "failed";
                log.error("The requested layer failed to download.");
                // throw exception in order for the workflow to fail
                throw new IllegalStateException("The requested layer failed to download.");
            }
        }

        // reload images from docker node
        this.reloadImages();
        // update inventory - another way to do this would be to update our ArrayList and call notifyElementDeleted on the image object
        notificationHandler.notifyElementInvalidate(toRef());

        log.debug("Pull operation " + downloadStatus + ". " + finalStatus + ".");
        return "Pull operation " + downloadStatus + ". " + finalStatus + ".";

    } catch (InternalServerErrorException e) {
        // image dosn't exist
        log.error("Error: the image was not found.");
        // Throw error detail message so vCO can display it
        throw new Exception("Error: the image was not found.");
    } catch (Exception e) {
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw, true);
        e.printStackTrace(pw);

        log.error("Error while pulling image: " + sw.getBuffer().toString());
        // Throw error detail message so vCO can display it
        throw new Exception("Error while pulling image: " + sw.getBuffer().toString());
    } finally {
        if (it != null) {
            log.debug("Closeing pullImage stream...");
            it.close();
            log.debug("Closed pullImage stream.");
        }
    }

}