70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
package it.cavallium.dbengine.database.collections;
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import it.cavallium.dbengine.client.DbProgress;
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import it.cavallium.dbengine.client.CompositeSnapshot;
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import it.cavallium.dbengine.client.SSTVerificationProgress;
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import it.cavallium.dbengine.database.Delta;
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import it.cavallium.dbengine.database.LLUtils;
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import it.cavallium.dbengine.database.UpdateReturnMode;
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import it.cavallium.dbengine.database.serialization.SerializationFunction;
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import java.util.Objects;
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import java.util.stream.Stream;
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import org.jetbrains.annotations.Nullable;
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public interface DatabaseStage<T> extends DatabaseStageWithEntry<T> {
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@Nullable T get(@Nullable CompositeSnapshot snapshot);
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default T getOrDefault(@Nullable CompositeSnapshot snapshot, T defaultValue, boolean existsAlmostCertainly) {
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return Objects.requireNonNullElse(get(snapshot), defaultValue);
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}
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default T getOrDefault(@Nullable CompositeSnapshot snapshot, T defaultValue) {
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return getOrDefault(snapshot, defaultValue, false);
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}
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default void set(@Nullable T value) {
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this.setAndGetChanged(value);
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}
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@Nullable T setAndGetPrevious(@Nullable T value);
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default boolean setAndGetChanged(@Nullable T value) {
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T oldValue = this.setAndGetPrevious(value);
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if (oldValue != null) {
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return !Objects.equals(oldValue, value);
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} else {
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return value != null;
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}
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}
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default @Nullable T update(SerializationFunction<@Nullable T, @Nullable T> updater, UpdateReturnMode updateReturnMode) {
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return LLUtils.resolveDelta(this.updateAndGetDelta(updater), updateReturnMode);
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}
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Delta<T> updateAndGetDelta(SerializationFunction<@Nullable T, @Nullable T> updater);
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default void clear() {
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clearAndGetStatus();
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}
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@Nullable T clearAndGetPrevious();
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default boolean clearAndGetStatus() {
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return clearAndGetPrevious() != null;
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}
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/**
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* Count all the elements.
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* If it's a nested collection the count will include all the children recursively
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* @param fast true to return an approximate value
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*/
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long leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast);
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default boolean isEmpty(@Nullable CompositeSnapshot snapshot) {
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return leavesCount(snapshot, false) <= 0;
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}
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Stream<DbProgress<SSTVerificationProgress>> verifyChecksum();
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}
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