Implement standard task schedulers

This change implements default tasks scheduling algorithms like FIFO or SRTF
and adds them to to the standard library.

1 files changed, 71 insertions, 0 deletions

diff --git a/opendc-stdlib/src/main/kotlin/nl/atlarge/opendc/workload/Task.kt b/opendc-stdlib/src/main/kotlin/nl/atlarge/opendc/workload/Task.kt
new file mode 100644
index 00000000..9a8c84e6
--- /dev/null
+++ b/opendc-stdlib/src/main/kotlin/nl/atlarge/opendc/workload/Task.kt
@@ -0,0 +1,71 @@
+/*
+ * 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 nl.atlarge.opendc.workload
+
+/**
+ * A task represents some computation that is part of a [Job].
+ *
+ * @author Fabian Mastenbroek (f.s.mastenbroek@student.tudelft.nl)
+ */
+data class Task(
+	val id: Int,
+	val dependencies: Set<Task>,
+	val flops: Long
+) {
+	/**
+	 * The remaining amount of flops to compute.
+	 */
+	var remaining: Long = flops
+		private set
+
+	/**
+	 * A flag to indicate whether the task is finished.
+	 */
+	var finished: Boolean = false
+		private set
+
+	/**
+	 * Determine whether the task is ready to be processed.
+	 *
+	 * @return `true` if the task is ready to be processed, `false` otherwise.
+	 */
+	fun isReady() = dependencies.all { it.finished }
+
+	/**
+	 * Consume the given amount of flops of this task.
+	 *
+	 * @param flops The total amount of flops to consume.
+	 */
+	fun consume(flops: Long) {
+		if (finished)
+			return
+		if (remaining <= flops) {
+			finished = true
+			remaining = 0
+		} else {
+			remaining -= flops
+		}
+	}
+}