57 lines
1.4 KiB
Java
57 lines
1.4 KiB
Java
package it.cavallium.dbengine.client;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicInteger;
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public abstract class Backuppable implements IBackuppable {
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public enum State {
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RUNNING, PAUSING, PAUSED, RESUMING, STOPPED
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}
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private final AtomicInteger state = new AtomicInteger();
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@Override
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public final void pauseForBackup() {
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if (state.compareAndSet(State.RUNNING.ordinal(), State.PAUSING.ordinal())) {
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try {
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onPauseForBackup();
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state.compareAndSet(State.PAUSING.ordinal(), State.PAUSED.ordinal());
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} catch (Throwable ex) {
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state.compareAndSet(State.PAUSING.ordinal(), State.RUNNING.ordinal());
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throw ex;
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}
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}
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}
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@Override
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public final void resumeAfterBackup() {
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if (state.compareAndSet(State.PAUSED.ordinal(), State.RESUMING.ordinal())) {
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try {
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onResumeAfterBackup();
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state.compareAndSet(State.RESUMING.ordinal(), State.RUNNING.ordinal());
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} catch (Throwable ex) {
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state.compareAndSet(State.RESUMING.ordinal(), State.PAUSED.ordinal());
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throw ex;
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}
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}
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}
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@Override
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public final boolean isPaused() {
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return state.get() == State.PAUSED.ordinal();
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}
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public final State getState() {
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return State.values()[state.get()];
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}
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protected abstract void onPauseForBackup();
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protected abstract void onResumeAfterBackup();
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public final void setStopped() {
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state.set(State.STOPPED.ordinal());
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}
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}
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