Add snapshottable collection lock
This commit is contained in:
Andrea Cavalli
parent
5f0e5419c9
commit
27ea0deaed
@ -0,0 +1,372 @@
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package org.warp.commonutils.locks;
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import it.cavallium.concurrentlocks.ReadWriteUpdateLock;
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import java.util.Objects;
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import java.util.Set;
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import org.jetbrains.annotations.NotNull;
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/**
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* Fine-grained locking on data or on the entire collection for a snapshottable collection
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* @param <T>
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*/
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public class SnapshottableCollectionLock<T> {
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private final TransitReadWriteLock fullLock;
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private final TransitReadWriteLock dataLock;
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private final Striped<ReadWriteUpdateLock> transactionLock;
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public SnapshottableCollectionLock(int stripedSize) {
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this.transactionLock = Striped.readWriteUpdateLock(stripedSize);
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this.fullLock = new TransitReadWriteLock();
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this.dataLock = new TransitReadWriteLock();
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}
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public enum DataLockType {
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READ,
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/**
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* "Update" allow reads but blocks writes and other updates.
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*/
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UPDATE,
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WRITE
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}
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public enum FullLockType {
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/** <p>This lock is a read lock for "full", nothing for "data"</p>
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* <p>Useful for coarse iterators</p>
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*
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* <ul>
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* <li>full<ul>
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* <li>read: allow</li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* <li>data<ul>
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* <li>read/update: allow</li>
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* <li>write: allow</li>
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* </ul></li>
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* </ul>
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*/
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DENY_ONLY_FULL_WRITE,
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/** <p>This lock is a read lock for "full" and a read lock for "data"</p>
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*
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* <ul>
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* <li>full<ul>
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* <li>read: allow</li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* <li>data<ul>
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* <li>read/update: allow</li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* </ul>
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*/
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ALLOW_ONLY_READ,
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/** <p>This lock is a write lock for "full" and a read lock for "data"</p>
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*
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* <ul>
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* <li>full<ul>
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* <li>read: <u>deny</u></li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* <li>data<ul>
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* <li>read/update: allow</li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* </ul>
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*/
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ALLOW_ONLY_ITEMS_READ,
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/** <p>This lock is a read lock for "full" and a write lock for "data"</p>
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*
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* <ul>
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* <li>full<ul>
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* <li>read: allow</li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* <li>data<ul>
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* <li>read/update: <u>deny</u></li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* </ul>
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*/
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ALLOW_ONLY_FULL_READ,
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/** <p>This lock is a write lock for "full" and a write lock for "data"</p>
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*
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* <ul>
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* <li>full<ul>
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* <li>read: <u>deny</u></li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* <li>data<ul>
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* <li>read/update: <u>deny</u></li>
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* <li>write: <u>deny</u></li>
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* </ul></li>
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* </ul>
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*/
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EXCLUSIVE;
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public static final Set<FullLockType> READ_FULL_TYPES = Set.of(
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DENY_ONLY_FULL_WRITE,
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ALLOW_ONLY_READ,
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ALLOW_ONLY_FULL_READ
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);
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public static final Set<FullLockType> WRITE_FULL_TYPES = Set.of(ALLOW_ONLY_ITEMS_READ, EXCLUSIVE);
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public static final Set<FullLockType> READ_DATA_TYPES = Set.of(ALLOW_ONLY_READ, ALLOW_ONLY_ITEMS_READ);
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public static final Set<FullLockType> WRITE_DATA_TYPES = Set.of(ALLOW_ONLY_FULL_READ, EXCLUSIVE);
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public static final Set<FullLockType> NOOP_DATA_TYPES = Set.of(DENY_ONLY_FULL_WRITE);
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}
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public void fullLock(Object snapshot, FullLockType fullLockMode) {
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if (snapshot == null) {
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// Transit on full locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_FULL_READ:
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fullLock.startTransitRead();
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break;
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case ALLOW_ONLY_ITEMS_READ:
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case EXCLUSIVE:
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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// Manage full locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_FULL_READ:
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fullLock.disallowTransitWrite();
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break;
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case ALLOW_ONLY_ITEMS_READ:
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case EXCLUSIVE:
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fullLock.disallowTransit();
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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// Manage data locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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break;
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_ITEMS_READ:
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dataLock.disallowTransitWrite();
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break;
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case ALLOW_ONLY_FULL_READ:
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case EXCLUSIVE:
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dataLock.disallowTransit();
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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}
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}
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public void fullUnlock(Object snapshot, FullLockType fullLockMode) {
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if (snapshot == null) {
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// Manage full locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_FULL_READ:
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fullLock.reAllowTransitWrite();
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break;
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case ALLOW_ONLY_ITEMS_READ:
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case EXCLUSIVE:
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fullLock.reAllowTransit();
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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// Transit on full locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_FULL_READ:
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fullLock.endTransitRead();
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break;
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case ALLOW_ONLY_ITEMS_READ:
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case EXCLUSIVE:
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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// Manage data locks
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switch (fullLockMode) {
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case DENY_ONLY_FULL_WRITE:
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break;
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case ALLOW_ONLY_READ:
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case ALLOW_ONLY_ITEMS_READ:
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dataLock.reAllowTransitWrite();
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break;
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case ALLOW_ONLY_FULL_READ:
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case EXCLUSIVE:
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dataLock.reAllowTransit();
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break;
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default:
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throw new IllegalStateException("Unexpected value: " + fullLockMode);
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}
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}
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}
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private void partialLockKey(DataLockType dataLockMode, ReadWriteUpdateLock lock) {
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switch (dataLockMode) {
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case READ:
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dataLock.startTransitRead();
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lock.readLock().lock();
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break;
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//todo: check carefully if an update lock can lock dataLock only for data read.
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// If it can, replace startTransitWrite with startTransitRead here.
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case UPDATE:
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dataLock.startTransitWrite();
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lock.updateLock().lock();
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break;
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case WRITE:
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dataLock.startTransitWrite();
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lock.writeLock().lock();
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break;
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}
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}
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private void partialUnlockKey(DataLockType dataLockMode, ReadWriteUpdateLock lock) {
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switch (dataLockMode) {
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case READ:
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lock.readLock().unlock();
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dataLock.endTransitRead();
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break;
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//todo: check carefully if an update lock can lock dataLock only for data read.
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// If it can, replace startTransitWrite with startTransitRead here.
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case UPDATE:
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lock.updateLock().unlock();
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dataLock.endTransitWrite();
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break;
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case WRITE:
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lock.writeLock().unlock();
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dataLock.endTransitWrite();
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break;
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}
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}
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private void partialLockKeyUpgrade(DataLockType dataLockMode, ReadWriteUpdateLock lock) {
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switch (dataLockMode) {
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case READ:
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lock.readLock().lock();
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break;
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case UPDATE:
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lock.updateLock().lock();
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break;
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case WRITE:
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lock.writeLock().lock();
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break;
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}
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}
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private void partialUnlockKeyUpgrade(DataLockType dataLockMode, ReadWriteUpdateLock lock) {
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switch (dataLockMode) {
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case READ:
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lock.readLock().unlock();
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break;
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case UPDATE:
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lock.writeLock().unlock();
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break;
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case WRITE:
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lock.writeLock().unlock();
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break;
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}
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}
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public void dataLock(Object snapshot, DataLockType dataLockMode, @NotNull T key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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var lock = transactionLock.get(key);
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partialLockKey(dataLockMode, lock);
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}
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}
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public void dataLockAt(Object snapshot, DataLockType dataLockMode, int index) {
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if (snapshot == null) {
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var lock = transactionLock.getAt(index);
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partialLockKey(dataLockMode, lock);
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}
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}
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public void dataLockUpgrade(Object snapshot, DataLockType dataLockMode, @NotNull T key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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var lock = transactionLock.get(key);
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partialLockKeyUpgrade(dataLockMode, lock);
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}
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}
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public void dataLockUpgradeAt(Object snapshot, DataLockType dataLockMode, int index) {
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if (snapshot == null) {
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var lock = transactionLock.getAt(index);
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partialLockKeyUpgrade(dataLockMode, lock);
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}
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}
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public void dataUnlock(Object snapshot, DataLockType dataLockMode, @NotNull T key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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var lock = transactionLock.get(key);
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partialUnlockKey(dataLockMode, lock);
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}
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}
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public void dataUnlockAt(Object snapshot, DataLockType dataLockMode, int index) {
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if (snapshot == null) {
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var lock = transactionLock.getAt(index);
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partialUnlockKey(dataLockMode, lock);
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}
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}
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public void dataUnlockUpgrade(Object snapshot, DataLockType dataLockMode, @NotNull T key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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var lock = transactionLock.get(key);
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partialUnlockKeyUpgrade(dataLockMode, lock);
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}
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}
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public void dataUnlockUpgradeAt(Object snapshot, DataLockType dataLockMode, @NotNull int index) {
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if (snapshot == null) {
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var lock = transactionLock.getAt(index);
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partialUnlockKeyUpgrade(dataLockMode, lock);
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}
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}
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public void dataLockMulti(Object snapshot, DataLockType dataLockMode, @NotNull Iterable<? extends T> key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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for (ReadWriteUpdateLock lock : transactionLock.bulkGet(key)) {
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partialLockKey(dataLockMode, lock);
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}
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}
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}
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public void dataLockAtMulti(Object snapshot, DataLockType dataLockMode, @NotNull Iterable<Integer> key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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for (ReadWriteUpdateLock lock : transactionLock.bulkGetAt(key)) {
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partialLockKey(dataLockMode, lock);
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}
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}
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}
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public void dataUnlockMulti(Object snapshot, DataLockType dataLockMode, @NotNull Iterable<? extends T> key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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for (ReadWriteUpdateLock lock : transactionLock.bulkGetInverse(key)) {
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partialUnlockKey(dataLockMode, lock);
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}
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}
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}
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public void dataUnlockAtMulti(Object snapshot, DataLockType dataLockMode, @NotNull Iterable<Integer> key) {
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if (snapshot == null) {
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Objects.requireNonNull(key, () -> "Lock key must not be null");
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for (ReadWriteUpdateLock lock : transactionLock.bulkGetAtInverse(key)) {
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partialUnlockKey(dataLockMode, lock);
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}
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}
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}
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}
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@ -134,6 +134,16 @@ public abstract class Striped<L> {
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* #get(Object)}; may contain duplicates), in an increasing index order.
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*/
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public Iterable<L> bulkGet(Iterable<?> keys) {
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return Collections.unmodifiableList(bulkGet_(keys));
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}
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public Iterable<L> bulkGetInverse(Iterable<?> keys) {
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var list = bulkGet_(keys);
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Collections.reverse(list);
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return Collections.unmodifiableList(list);
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}
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private List<L> bulkGet_(Iterable<?> keys) {
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// Initially using the array to store the keys, then reusing it to store the respective L's
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final Object[] array = Iterables.toArray(keys, Object.class);
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if (array.length == 0) {
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@ -175,7 +185,61 @@ public abstract class Striped<L> {
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*/
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@SuppressWarnings("unchecked") // we carefully replaced all keys with their respective L's
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List<L> asList = (List<L>) Arrays.asList(array);
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return Collections.unmodifiableList(asList);
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return asList;
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}
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public Iterable<L> bulkGetAt(Iterable<Integer> keys) {
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return Collections.unmodifiableList(bulkGetAt_(keys));
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}
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public Iterable<L> bulkGetAtInverse(Iterable<Integer> keys) {
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var list = bulkGetAt_(keys);
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Collections.reverse(list);
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return Collections.unmodifiableList(list);
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}
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private List<L> bulkGetAt_(Iterable<Integer> keys) {
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// Initially using the array to store the keys, then reusing it to store the respective L's
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final Object[] array = Iterables.toArray(keys, Object.class);
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if (array.length == 0) {
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return ImmutableList.of();
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}
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int[] stripes = new int[array.length];
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for (int i = 0; i < array.length; i++) {
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stripes[i] = (int) array[i];
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}
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Arrays.sort(stripes);
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// optimize for runs of identical stripes
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int previousStripe = stripes[0];
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array[0] = getAt(previousStripe);
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for (int i = 1; i < array.length; i++) {
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int currentStripe = stripes[i];
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if (currentStripe == previousStripe) {
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array[i] = array[i - 1];
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} else {
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array[i] = getAt(currentStripe);
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previousStripe = currentStripe;
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}
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}
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/*
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* Note that the returned Iterable holds references to the returned stripes, to avoid
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* error-prone code like:
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*
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* Striped<Lock> stripedLock = Striped.lazyWeakXXX(...)'
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* Iterable<Lock> locks = stripedLock.bulkGet(keys);
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* for (Lock lock : locks) {
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* lock.lock();
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* }
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* operation();
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* for (Lock lock : locks) {
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* lock.unlock();
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* }
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*
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* If we only held the int[] stripes, translating it on the fly to L's, the original locks might
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* be garbage collected after locking them, ending up in a huge mess.
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*/
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@SuppressWarnings("unchecked") // we carefully replaced all keys with their respective L's
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List<L> asList = (List<L>) Arrays.asList(array);
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return asList;
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}
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// Static factories
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@ -1,4 +1,4 @@
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package org.warp.commonutils.functional.org.warp.commonutils.locks;
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package org.warp.commonutils.locks;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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@ -8,7 +8,6 @@ import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.Timeout;
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import org.warp.commonutils.locks.LeftRightLock;
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public class LeftRightLockTest {
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@ -0,0 +1,129 @@
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package org.warp.commonutils.locks;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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import org.warp.commonutils.locks.SnapshottableCollectionLock.DataLockType;
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import org.warp.commonutils.locks.SnapshottableCollectionLock.FullLockType;
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|
||||
public class SnapshottableCollectionLockTest {
|
||||
|
||||
@Test
|
||||
public void testNoop() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
checkSituation(lock, true, true, true, true);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDenyOnlyFullWrite() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
lock.fullLock(null, FullLockType.DENY_ONLY_FULL_WRITE);
|
||||
checkSituation(lock, true, false, true, true);
|
||||
lock.fullUnlock(null, FullLockType.DENY_ONLY_FULL_WRITE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAllowOnlyRead() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
lock.fullLock(null, FullLockType.ALLOW_ONLY_READ);
|
||||
checkSituation(lock, true, false, true, false);
|
||||
lock.fullUnlock(null, FullLockType.ALLOW_ONLY_READ);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAllowOnlyItemsRead() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
lock.fullLock(null, FullLockType.ALLOW_ONLY_ITEMS_READ);
|
||||
checkSituation(lock, false, false, true, false);
|
||||
lock.fullUnlock(null, FullLockType.ALLOW_ONLY_ITEMS_READ);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAllowOnlyFullRead() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
lock.fullLock(null, FullLockType.ALLOW_ONLY_FULL_READ);
|
||||
checkSituation(lock, true, false, false, false);
|
||||
lock.fullUnlock(null, FullLockType.ALLOW_ONLY_FULL_READ);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testExclusive() {
|
||||
var lock = new SnapshottableCollectionLock<Long>(50);
|
||||
lock.fullLock(null, FullLockType.EXCLUSIVE);
|
||||
checkSituation(lock, false, false, false, false);
|
||||
lock.fullUnlock(null, FullLockType.EXCLUSIVE);
|
||||
}
|
||||
|
||||
private void checkSituation(SnapshottableCollectionLock<Long> lock, boolean fullReadAllow, boolean fullWriteAllow, boolean dataReadAllow, boolean dataWriteAllow) {
|
||||
|
||||
for (FullLockType readFullType : FullLockType.READ_FULL_TYPES) {
|
||||
if (fullReadAllow) {
|
||||
Assertions.assertDoesNotThrow(() -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.fullLock(null, readFullType);
|
||||
lock.fullUnlock(null, readFullType);
|
||||
}).get(1, TimeUnit.SECONDS);
|
||||
});
|
||||
} else {
|
||||
Assertions.assertThrows(TimeoutException.class, () -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.fullLock(null, readFullType);
|
||||
lock.fullUnlock(null, readFullType);
|
||||
}).get(50, TimeUnit.MILLISECONDS);
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
for (FullLockType writeFullType : FullLockType.WRITE_FULL_TYPES) {
|
||||
if (fullWriteAllow) {
|
||||
Assertions.assertDoesNotThrow(() -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.fullLock(null, writeFullType);
|
||||
lock.fullUnlock(null, writeFullType);
|
||||
}).get(1, TimeUnit.SECONDS);
|
||||
});
|
||||
} else {
|
||||
Assertions.assertThrows(TimeoutException.class, () -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.fullLock(null, writeFullType);
|
||||
lock.fullUnlock(null, writeFullType);
|
||||
}).get(50, TimeUnit.MILLISECONDS);
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
if (dataReadAllow) {
|
||||
Assertions.assertDoesNotThrow(() -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.dataLock(null, DataLockType.READ, 1L);
|
||||
lock.dataUnlock(null, DataLockType.READ, 1L);
|
||||
}).get(1, TimeUnit.SECONDS);
|
||||
});
|
||||
} else {
|
||||
Assertions.assertThrows(TimeoutException.class, () -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.dataLock(null, DataLockType.READ, 1L);
|
||||
lock.dataUnlock(null, DataLockType.READ, 1L);
|
||||
}).get(50, TimeUnit.MILLISECONDS);
|
||||
});
|
||||
}
|
||||
|
||||
if (dataWriteAllow) {
|
||||
Assertions.assertDoesNotThrow(() -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.dataLock(null, DataLockType.WRITE, 1L);
|
||||
lock.dataUnlock(null, DataLockType.WRITE, 1L);
|
||||
}).get(1, TimeUnit.SECONDS);
|
||||
});
|
||||
} else {
|
||||
Assertions.assertThrows(TimeoutException.class, () -> {
|
||||
CompletableFuture.runAsync(() -> {
|
||||
lock.dataLock(null, DataLockType.WRITE, 1L);
|
||||
lock.dataUnlock(null, DataLockType.WRITE, 1L);
|
||||
}).get(50, TimeUnit.MILLISECONDS);
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user