refactor(#18): Redesign core simulation API

This change contains the redesign of the core simulation API and
provides a cleaner interface for developing simulation models for the
users.

Closes #18

2 files changed, 106 insertions, 0 deletions

diff --git a/opendc-model-odc/setup/src/main/kotlin/com/atlarge/opendc/model/odc/platform/JpaPlatformRunner.kt b/opendc-model-odc/setup/src/main/kotlin/com/atlarge/opendc/model/odc/platform/JpaPlatformRunner.kt
new file mode 100644
index 00000000..13f322bc
--- /dev/null
+++ b/opendc-model-odc/setup/src/main/kotlin/com/atlarge/opendc/model/odc/platform/JpaPlatformRunner.kt
@@ -0,0 +1,65 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 atlarge-research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.atlarge.opendc.model.odc.platform
+
+import com.atlarge.opendc.omega.OmegaKernel
+import mu.KotlinLogging
+import java.util.concurrent.Executors
+import javax.persistence.Persistence
+
+val logger = KotlinLogging.logger {}
+
+/**
+ * The main entry point of the program. This program polls experiments from a database and runs the
+ * simulation and reports the results back to the database.
+ *
+ * @param args The command line arguments of the program.
+ */
+fun main(args: Array<String>) {
+    val properties = HashMap<Any, Any>()
+    val env = System.getenv()
+    properties["javax.persistence.jdbc.url"] = env["PERSISTENCE_URL"] ?: ""
+    properties["javax.persistence.jdbc.user"] = env["PERSISTENCE_USER"] ?: ""
+    properties["javax.persistence.jdbc.password"] = env["PERSISTENCE_PASSWORD"] ?: ""
+    val factory = Persistence.createEntityManagerFactory("opendc-simulator", properties)
+
+    val timeout = 10000L
+    val threads = 4
+    val executorService = Executors.newFixedThreadPool(threads)
+    val experiments = JpaExperimentManager(factory)
+    val kernel = OmegaKernel
+
+    logger.info { "Waiting for enqueued experiments..." }
+    while (true) {
+        experiments.poll()?.let { experiment ->
+            logger.info { "Found experiment. Submitting for simulation now..." }
+            executorService.submit {
+                experiment.use { it.run(kernel, timeout) }
+            }
+        }
+
+        Thread.sleep(500)
+    }
+}
diff --git a/opendc-model-odc/setup/src/main/resources/META-INF/persistence.xml b/opendc-model-odc/setup/src/main/resources/META-INF/persistence.xml
new file mode 100644
index 00000000..4c4e6ac7
--- /dev/null
+++ b/opendc-model-odc/setup/src/main/resources/META-INF/persistence.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ MIT License
+  ~
+  ~ Copyright (c) 2017 atlarge-research
+  ~
+  ~ Permission is hereby granted, free of charge, to any person obtaining a copy
+  ~ of this software and associated documentation files (the "Software"), to deal
+  ~ in the Software without restriction, including without limitation the rights
+  ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  ~ copies of the Software, and to permit persons to whom the Software is
+  ~ furnished to do so, subject to the following conditions:
+  ~
+  ~ The above copyright notice and this permission notice shall be included in all
+  ~ copies or substantial portions of the Software.
+  ~
+  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  ~ SOFTWARE.
+  -->
+
+<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xmlns="http://java.sun.com/xml/ns/persistence"
+             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
+             version="2.0">
+    <persistence-unit name="opendc-simulator">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+        <mapping-file>jpa/schema.xml</mapping-file>
+        <properties>
+            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
+            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
+            <property name="hibernate.show_sql" value="false"/>
+            <property name="hibernate.hbm2ddl.auto" value="validate"/>
+            <property name="hibernate.jdbc.batch_size" value="50"/>
+        </properties>
+    </persistence-unit>
+</persistence>