build: Migrate to flat project structure

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.

3 files changed, 126 insertions, 0 deletions

diff --git a/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Job.kt b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Job.kt
new file mode 100644
index 00000000..5e8b0b9e
--- /dev/null
+++ b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Job.kt
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021 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 org.opendc.workflow.api
+
+import java.util.*
+
+/**
+ * A workload that represents a directed acyclic graph (DAG) of tasks with control and data dependencies between tasks.
+ *
+ * @property uid A unique identified of this workflow.
+ * @property name The name of this workflow.
+ * @property tasks The tasks that are part of this workflow.
+ * @property metadata Additional metadata for the job.
+ */
+public data class Job(
+    val uid: UUID,
+    val name: String,
+    val tasks: Set<Task>,
+    val metadata: Map<String, Any> = emptyMap()
+) {
+    override fun equals(other: Any?): Boolean = other is Job && uid == other.uid
+
+    override fun hashCode(): Int = uid.hashCode()
+
+    override fun toString(): String = "Job(uid=$uid, name=$name, tasks=${tasks.size}, metadata=$metadata)"
+}
diff --git a/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Metadata.kt b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Metadata.kt
new file mode 100644
index 00000000..db208998
--- /dev/null
+++ b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Metadata.kt
@@ -0,0 +1,35 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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 org.opendc.workflow.api
+
+/**
+ * Meta-data key for the deadline of a task.
+ */
+public const val WORKFLOW_TASK_DEADLINE: String = "workflow:task:deadline"
+
+/**
+ * Meta-data key for the number of cores needed for a task.
+ */
+public const val WORKFLOW_TASK_CORES: String = "workflow:task:cores"
diff --git a/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Task.kt b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Task.kt
new file mode 100644
index 00000000..d91f9879
--- /dev/null
+++ b/opendc-workflow/opendc-workflow-api/src/main/kotlin/org/opendc/workflow/api/Task.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2021 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 org.opendc.workflow.api
+
+import java.util.*
+
+/**
+ * A stage of a [Job].
+ *
+ * @property uid A unique identified of this task.
+ * @property name The name of this task.
+ * @property image The application image to run as part of this workflow task.
+ * @property dependencies The dependencies of this task in order for it to execute.
+ * @property metadata Additional metadata for this task.
+ */
+public data class Task(
+    val uid: UUID,
+    val name: String,
+    val dependencies: Set<Task>,
+    val metadata: Map<String, Any> = emptyMap()
+) {
+    override fun equals(other: Any?): Boolean = other is Task && uid == other.uid
+
+    override fun hashCode(): Int = uid.hashCode()
+}