Examples with JsonGenerator com.fasterxml.jackson.core.JsonGenerator used on opensource projects

Example 26 with JsonGenerator

use of com.fasterxml.jackson.core.JsonGenerator in project jvm-serializers by eishay.

the class WriteResultsToJavascript method writeOutputFile.

// ----------------------------------------------------------------------------
// Write output file.
private static void writeOutputFile(File outputFile, List<Entry> entries) throws Exit {
    // Write output.
    try {
        FileOutputStream fout = new FileOutputStream(outputFile);
        try {
            JsonFactory factory = new JsonFactory();
            factory.disable(JsonGenerator.Feature.QUOTE_FIELD_NAMES);
            JsonGenerator gen = factory.createGenerator(fout, JsonEncoding.UTF8);
            gen.useDefaultPrettyPrinter();
            fout.write("var benchmarkResults = ".getBytes("UTF-8"));
            writeJavascriptStats(gen, columns, entries);
        } finally {
            fout.close();
        }
    } catch (IOException ex) {
        throw new Exit(1, "Error writing to output file \"" + outputFile.getPath() + "\": " + ex.getMessage());
    }
}

Example 27 with JsonGenerator

use of com.fasterxml.jackson.core.JsonGenerator in project opentsdb by OpenTSDB.

the class Annotation method getStorageJSON.

/**
   * Serializes the object in a uniform matter for storage. Needed for 
   * successful CAS calls
   * @return The serialized object as a byte array
   */
@VisibleForTesting
byte[] getStorageJSON() {
    // TODO - precalculate size
    final ByteArrayOutputStream output = new ByteArrayOutputStream();
    try {
        final JsonGenerator json = JSON.getFactory().createGenerator(output);
        json.writeStartObject();
        if (tsuid != null && !tsuid.isEmpty()) {
            json.writeStringField("tsuid", tsuid);
        }
        json.writeNumberField("startTime", start_time);
        json.writeNumberField("endTime", end_time);
        json.writeStringField("description", description);
        json.writeStringField("notes", notes);
        if (custom == null) {
            json.writeNullField("custom");
        } else {
            final TreeMap<String, String> sorted_custom = new TreeMap<String, String>(custom);
            json.writeObjectField("custom", sorted_custom);
        }
        json.writeEndObject();
        json.close();
        return output.toByteArray();
    } catch (IOException e) {
        throw new RuntimeException("Unable to serialize Annotation", e);
    }
}

Example 28 with JsonGenerator

use of com.fasterxml.jackson.core.JsonGenerator in project opentsdb by OpenTSDB.

the class TSMeta method getStorageJSON.

/**
   * Formats the JSON output for writing to storage. It drops objects we don't
   * need or want to store (such as the UIDMeta objects or the total dps) to
   * save space. It also serializes in order so that we can make a proper CAS
   * call. Otherwise the POJO serializer may place the fields in any order
   * and CAS calls would fail all the time.
   * @return A byte array to write to storage
   */
private byte[] getStorageJSON() {
    // 256 bytes is a good starting value, assumes default info
    final ByteArrayOutputStream output = new ByteArrayOutputStream(256);
    try {
        final JsonGenerator json = JSON.getFactory().createGenerator(output);
        json.writeStartObject();
        json.writeStringField("tsuid", tsuid);
        json.writeStringField("displayName", display_name);
        json.writeStringField("description", description);
        json.writeStringField("notes", notes);
        json.writeNumberField("created", created);
        if (custom == null) {
            json.writeNullField("custom");
        } else {
            json.writeObjectFieldStart("custom");
            for (Map.Entry<String, String> entry : custom.entrySet()) {
                json.writeStringField(entry.getKey(), entry.getValue());
            }
            json.writeEndObject();
        }
        json.writeStringField("units", units);
        json.writeStringField("dataType", data_type);
        json.writeNumberField("retention", retention);
        json.writeNumberField("max", max);
        json.writeNumberField("min", min);
        json.writeEndObject();
        json.close();
        return output.toByteArray();
    } catch (IOException e) {
        throw new RuntimeException("Unable to serialize TSMeta", e);
    }
}

Example 29 with JsonGenerator

use of com.fasterxml.jackson.core.JsonGenerator in project opentsdb by OpenTSDB.

the class UIDMeta method getStorageJSON.

/**
   * Formats the JSON output for writing to storage. It drops objects we don't
   * need or want to store (such as the UIDMeta objects or the total dps) to
   * save space. It also serializes in order so that we can make a proper CAS
   * call. Otherwise the POJO serializer may place the fields in any order
   * and CAS calls would fail all the time.
   * @return A byte array to write to storage
   */
private byte[] getStorageJSON() {
    // 256 bytes is a good starting value, assumes default info
    final ByteArrayOutputStream output = new ByteArrayOutputStream(256);
    try {
        final JsonGenerator json = JSON.getFactory().createGenerator(output);
        json.writeStartObject();
        json.writeStringField("type", type.toString());
        json.writeStringField("displayName", display_name);
        json.writeStringField("description", description);
        json.writeStringField("notes", notes);
        json.writeNumberField("created", created);
        if (custom == null) {
            json.writeNullField("custom");
        } else {
            json.writeObjectFieldStart("custom");
            for (Map.Entry<String, String> entry : custom.entrySet()) {
                json.writeStringField(entry.getKey(), entry.getValue());
            }
            json.writeEndObject();
        }
        json.writeEndObject();
        json.close();
        return output.toByteArray();
    } catch (IOException e) {
        throw new RuntimeException("Unable to serialize UIDMeta", e);
    }
}

Example 30 with JsonGenerator

use of com.fasterxml.jackson.core.JsonGenerator in project opentsdb by OpenTSDB.

the class QueryExecutor method serialize.

/**
   * Writes the results to a ChannelBuffer to return to the caller. This will
   * iterate over all of the outputs and drop in meta data where appropriate.
   * @throws Exception if something went pear shaped
   */
private Deferred<ChannelBuffer> serialize() throws Exception {
    final long start = System.currentTimeMillis();
    // buffers and an array list to stored the deferreds
    final ChannelBuffer response = ChannelBuffers.dynamicBuffer();
    final OutputStream output_stream = new ChannelBufferOutputStream(response);
    final JsonGenerator json = JSON.getFactory().createGenerator(output_stream);
    json.writeStartObject();
    json.writeFieldName("outputs");
    json.writeStartArray();
    // We want the serializer to execute serially so we need to create a callback
    // chain so that when one DPsResolver is finished, it triggers the next to
    // start serializing.
    final Deferred<Object> cb_chain = new Deferred<Object>();
    // default to the expressions if there, or fall back to the metrics
    final List<Output> outputs;
    if (query.getOutputs() == null || query.getOutputs().isEmpty()) {
        if (query.getExpressions() != null && !query.getExpressions().isEmpty()) {
            outputs = new ArrayList<Output>(query.getExpressions().size());
            for (final Expression exp : query.getExpressions()) {
                outputs.add(Output.Builder().setId(exp.getId()).build());
            }
        } else if (query.getMetrics() != null && !query.getMetrics().isEmpty()) {
            outputs = new ArrayList<Output>(query.getMetrics().size());
            for (final Metric metric : query.getMetrics()) {
                outputs.add(Output.Builder().setId(metric.getId()).build());
            }
        } else {
            throw new IllegalArgumentException("How did we get here?? No metrics or expressions??");
        }
    } else {
        outputs = query.getOutputs();
    }
    for (final Output output : outputs) {
        if (expressions != null) {
            final ExpressionIterator it = expressions.get(output.getId());
            if (it != null) {
                cb_chain.addCallback(new SerializeExpressionIterator(tsdb, json, output, it, ts_query));
                continue;
            }
        }
        if (query.getMetrics() != null && !query.getMetrics().isEmpty()) {
            final TSSubQuery sub = sub_queries.get(output.getId());
            if (sub != null) {
                final TimeSyncedIterator it = new TimeSyncedIterator(output.getId(), sub.getFilterTagKs(), sub_query_results.get(output.getId()));
                cb_chain.addCallback(new SerializeSubIterator(tsdb, json, output, it));
                continue;
            }
        } else {
            LOG.warn("Couldn't find a variable matching: " + output.getId() + " in query " + query);
        }
    }
    /** Final callback to close out the JSON array and return our results */
    class FinalCB implements Callback<ChannelBuffer, Object> {

        public ChannelBuffer call(final Object obj) throws Exception {
            json.writeEndArray();
            //        ts_query.getQueryStats().setTimeSerialization(
            //            DateTime.currentTimeMillis() - start);
            ts_query.getQueryStats().markSerializationSuccessful();
            // dump the original query
            if (true) {
                json.writeFieldName("query");
                json.writeObject(QueryExecutor.this.query);
            }
            // IMPORTANT Make sure the close the JSON array and the generator
            json.writeEndObject();
            json.close();
            return response;
        }
    }
    // trigger the callback chain here
    cb_chain.callback(null);
    return cb_chain.addCallback(new FinalCB());
}