Add an api for giving local-dynamo more heap

lib/launch.js

@@ -8,11 +8,33 @@ var cp = require('child_process')
 var path = require('path')
 
 /**
- * @param {?string} databaseDir The location of database files. Will run in memory if null.
- * @param {number} port
+ * An options object:
+ *   port: {number} - The port to run on. Required.
+ *   dir: {?string=} - The location of database files. Optional Will run in-memory if null.
+ *   heap: {?string=} - The amount of heap space, e.g., 512m. If not specified, uses JVM defaults.
+ * @typedef {Object}
+ */
+var Options;
+
+/**
+ * @param {?string|Options} options The options object. For backwards compatibility,
+ *     accepts a string as the database dir.
+ * @param {=number} port The port. Prefer using the options object.
  * @return {ChildProcess}
  */
-function launch(databaseDir, port) {
+function launch(options, port) {
+  if (typeof options == 'string') {
+    options = {dir: options}
+  } else {
+    options = options || {}
+  }
+
+  options.port = options.port || port
+
+  if (isNaN(options.port)) {
+    throw Error('Port required')
+  }
+
   var opts = {env: process.env}
   var javaDir = path.join(__dirname, '..', 'aws_dynamodb_local')
   var libDir = path.join(javaDir, 'DynamoDBLocal_lib')
@@ -23,13 +45,17 @@ function launch(databaseDir, port) {
     '-jar',
     path.join(javaDir, 'DynamoDBLocal.jar'),
     '--port',
-    port
+    options.port
   ]
 
-  if (databaseDir === null) {
-    args.push('--inMemory')
+  if (options.heap) {
+    args.push('-Xmx=' + options.heap)
+  }
+
+  if (options.dir) {
+    opts.cwd = path.resolve(options.dir)
   } else {
-    opts.cwd = path.resolve(databaseDir)
+    args.push('--inMemory')
   }
 
   return cp.spawn(cmd, args, opts)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "local-dynamo",
   "description": "A Node.js wrapper of AWS DynamoDB Local and utilities",
-  "version": "0.0.6",
+  "version": "0.1.0",
   "homepage": "https://github.com/Medium/local-dynamo",
   "licenses": [
     {