SCRIPT Move java files

wpilibj/src/main/java/org/wpilib/event/EventLoop.java

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+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj.event;
+
+import java.util.Collection;
+import java.util.ConcurrentModificationException;
+import java.util.LinkedHashSet;
+
+/**
+ * A declarative way to bind a set of actions to a loop and execute them when the loop is polled.
+ */
+public final class EventLoop {
+  private final Collection<Runnable> m_bindings = new LinkedHashSet<>();
+  private boolean m_running;
+
+  /** Default constructor. */
+  public EventLoop() {}
+
+  /**
+   * Bind a new action to run when the loop is polled.
+   *
+   * @param action the action to run.
+   */
+  public void bind(Runnable action) {
+    if (m_running) {
+      throw new ConcurrentModificationException("Cannot bind EventLoop while it is running");
+    }
+    m_bindings.add(action);
+  }
+
+  /** Poll all bindings. */
+  @SuppressWarnings("PMD.UnusedAssignment")
+  public void poll() {
+    try {
+      m_running = true;
+      m_bindings.forEach(Runnable::run);
+    } finally {
+      m_running = false;
+    }
+  }
+
+  /** Clear all bindings. */
+  public void clear() {
+    if (m_running) {
+      throw new ConcurrentModificationException("Cannot clear EventLoop while it is running");
+    }
+    m_bindings.clear();
+  }
+}