// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package com.intellij.openapi.components;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Every component which would like to persist its state across IDE restarts
 * should implement this interface.
 * <p>
 * See <a href="http://www.jetbrains.org/intellij/sdk/docs/basics/persisting_state_of_components.html">IntelliJ Platform SDK DevGuide</a>
 * for detailed description.
 * <p>
 * Do NOT use for sensitive data, see <a href="http://www.jetbrains.org/intellij/sdk/docs/basics/persisting_sensitive_data.html">Persisting Sensitive Data</a>.
 * <p>
 * In general, implementation should be thread-safe, because "loadState" is called from the same thread where component is initialized.
 * If component used only from one thread (e.g. EDT), thread-safe implementation is not required.
 */
public interface PersistentStateComponent<T> {
  /**
   * @return a component state. All properties, public and annotated fields are serialized. Only values, which differ
   * from the default (i.e., the value of newly instantiated class) are serialized. {@code null} value indicates
   * that the returned state won't be stored, as a result previously stored state will be used.
   * @see com.intellij.util.xmlb.XmlSerializer
   */
  @Nullable
  T getState();

  /**
   * This method is called when new component state is loaded. The method can and will be called several times, if
   * config files were externally changed while IDE was running.
   * <p>
   * State object should be used directly, defensive copying is not required.
   *
   * @param state loaded component state
   * @see com.intellij.util.xmlb.XmlSerializerUtil#copyBean(Object, Object)
   */
  void loadState(@NotNull T state);

  /**
   * This method is called when the component is initialized, but no state is persisted.
   */
  default void noStateLoaded() {
  }

  /**
   * If class also is a component, then this method will be called after loading state (even if not state) but only once throughout the life cycle
   */
  default void initializeComponent() {
  }
}

@@ -961,16 +961,58 @@
 quired.%0A
+ *%0A * @see SimplePersistentStateComponent%0A
  */%0Apubl

migrate KubernetesProjectSettings to SimplePersistentStateComponent, fix last regression about KubernetesConfigurable isModified check