Examples of org.json_voltpatches.JSONStringer

org.json_voltpatches.JSONStringer
JSONStringer provides a quick and convenient way of producing JSON text. The texts produced strictly conform to JSON syntax rules. No whitespace is added, so the results are ready for transmission or storage. Each instance of JSONStringer can produce one JSON text.
A JSONStringer instance provides a value method for appending values to the text, and a key method for adding keys before values in objects. There are array and endArray methods that make and bound array values, and object and endObject methods which make and bound object values. All of these methods return the JSONWriter instance, permitting cascade style. For example,
```
 myString = new JSONStringer() .object() .key("JSON") .value("Hello, World!") .endObject() .toString();
```
which produces the string
```
 {"JSON":"Hello, World!"}
```
The first method called must be array or object. There are no methods for adding commas or colons. JSONStringer adds them for you. Objects and arrays can be nested up to 20 levels deep.
This can sometimes be easier than using a JSONObject to build a string. @author JSON.org @version 2008-09-18

     * @return
     */
    private String serializeRestoreInformation(Long max, Set<SnapshotInfo> snapshots)
    {
        try {
            JSONStringer stringer = new JSONStringer();
            stringer.object();
            // optional max value.
            if (max != null) {
                stringer.key("max").value(max);
            }
            // 1 means recover, 0 means to create new DB
            stringer.key("action").value(m_action.ordinal());
            stringer.key("snapInfos").array();
            for (SnapshotInfo snapshot : snapshots) {
                stringer.value(snapshot.toJSONObject());
            }
            stringer.endArray();
            stringer.endObject();
            return stringer.toString();
        } catch (JSONException je) {
            VoltDB.crashLocalVoltDB("Error exchanging snapshot info", true, je);
        }
        throw new RuntimeException("impossible codepath.");
    }

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            }
        }


        public JSONObject toJSONObject()
        {
            JSONStringer stringer = new JSONStringer();
            try {
                stringer.object();
                stringer.key("txnId").value(txnId);
                stringer.key("path").value(path);
                stringer.key("nonce").value(nonce);
                stringer.key("partitionCount").value(partitionCount);
                stringer.key("newPartitionCount").value(newPartitionCount);
                stringer.key("catalogCrc").value(catalogCrc);
                stringer.key("hostId").value(hostId);
                stringer.key("tables").array();
                for (Entry<String, Set<Integer>> p : partitions.entrySet()) {
                    stringer.object();
                    stringer.key("name").value(p.getKey());
                    stringer.key("partitions").array();
                    for (int pid : p.getValue()) {
                        stringer.value(pid);
                    }
                    stringer.endArray();
                    stringer.endObject();
                }
                stringer.endArray(); // tables
                stringer.key("partitionToTxnId").object();
                for (Entry<Integer,Long> e : partitionToTxnId.entrySet()) {
                    stringer.key(e.getKey().toString()).value(e.getValue());
                }
                stringer.endObject(); // partitionToTxnId
                stringer.key("instanceId").value(instanceId.serializeToJSONObject());
                stringer.key("digestTables").array();
                for (String digestTable : digestTables) {
                    stringer.value(digestTable);
                }
                stringer.endArray();
                stringer.key("fileTables").array();
                for (String fileTable : fileTables) {
                    stringer.value(fileTable);
                }
                stringer.endArray();
                stringer.endObject();
                return new JSONObject(stringer.toString());
            } catch (JSONException e) {
                VoltDB.crashLocalVoltDB("Invalid JSON communicate snapshot info.", true, e);
            }
            throw new RuntimeException("impossible.");
        }

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            if (m_zk.exists(VoltZK.lastKnownLiveNodes, null) == null)
            {
                // VoltZK.createPersistentZKNodes should have done this
                m_zk.create(VoltZK.lastKnownLiveNodes, null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            }
            JSONStringer stringer = new JSONStringer();
            stringer.object();
            stringer.key("liveNodes").array();
            for (Integer node : liveNodes) {
                stringer.value(node);
            }
            stringer.endArray();
            stringer.endObject();
            JSONObject obj = new JSONObject(stringer.toString());
            tmLog.debug("Writing live nodes to ZK: " + obj.toString(4));
            m_zk.setData(VoltZK.lastKnownLiveNodes, obj.toString(4).getBytes("UTF-8"), -1);
        } catch (Exception e) {
            VoltDB.crashLocalVoltDB("Unable to update known live nodes at ZK path: " +
                    VoltZK.lastKnownLiveNodes, true, e);

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        fs.writeInt(0);//Header length placeholder
        fs.writeByte(1);//Indicate the snapshot was not completed, set to true for the CRC calculation, false later
        for (int ii = 0; ii < 4; ii++) {
            fs.writeInt(version[ii]);//version
        }
        JSONStringer stringer = new JSONStringer();
        byte jsonBytes[] = null;
        try {
            stringer.object();
            stringer.key("txnId").value(txnId);
            stringer.key("hostId").value(hostId);
            stringer.key("hostname").value(hostname);
            stringer.key("clusterName").value(clusterName);
            stringer.key("databaseName").value(databaseName);
            stringer.key("tableName").value(tableName.toUpperCase());
            stringer.key("isReplicated").value(isReplicated);
            stringer.key("isCompressed").value(true);
            stringer.key("checksumType").value("CRC32C");
            stringer.key("timestamp").value(timestamp);
            /*
             * The timestamp string is for human consumption, automated stuff should use
             * the actual timestamp
             */
            stringer.key("timestampString").value(SnapshotUtil.formatHumanReadableDate(timestamp));
            if (!isReplicated) {
                stringer.key("partitionIds").array();
                for (int partitionId : partitionIds) {
                    stringer.value(partitionId);
                }
                stringer.endArray();


                stringer.key("numPartitions").value(numPartitions);
            }
            stringer.endObject();
            String jsonString = stringer.toString();
            JSONObject jsonObj = new JSONObject(jsonString);
            jsonString = jsonObj.toString(4);
            jsonBytes = jsonString.getBytes("UTF-8");
        } catch (Exception e) {
            throw new IOException(e);

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org.voltdb.DefaultSnapshotDataTarget

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org.voltdb.export.ExportDataSource

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