try {
            return lock.readFile(action);
        } finally {
            lock.close();
        }
    }

    @Override
    public void updateFile(Runnable action) throws LockTimeoutException, FileIntegrityViolationException {
        FileLock lock = manager.lock(targetFile, mode(FileLockManager.LockMode.Exclusive), displayName);
        try {

            signal.trigger()
        }

        where:
        lockMode << [Exclusive, Shared]
    }

    def "cannot acquire lock with mode #lockMode while another lock manager in same process is holding shared lock"() {
        given:
        def file = tmpDir.file("lock-file.bin")
        createLock(Shared, file)

        when:
        createLock(lockMode, file, manager2)

        then:
        thrown(LockTimeoutException)

    def initAction = Mock(CacheInitializationAction)
    def onOpenAction = Mock(Consumer)
    def onCloseAction = Mock(Consumer)
    def lockOptions = DefaultLockOptions.mode(FileLockManager.LockMode.Shared)
    def cacheAccess = new FixedSharedModeCrossProcessCacheAccess("<cache>", file, lockOptions, lockManager, initAction, onOpenAction, onCloseAction)

        expect:
        emptyDir.assertDoesNotExist()

        when:
        def cache = new DefaultPersistentDirectoryCache(emptyDir, "<display-name>", properties, mode(FileLockManager.LockMode.Shared), initializationAction, cacheCleanup, lockManager, Mock(ExecutorFactory), buildOperationRunner)
        try {
            cache.open()
        } finally {
            cache.close()
        }

        then:

     * </p>
     * <ul>
     *     <li>Using {@link org.gradle.cache.FileLockManager.LockMode#Exclusive} will lock the cache on open() in the exclusive mode and keep it locked until {@link PersistentCache#close()} is called.</li>

    private Consumer<? super PersistentCache> initializer;
    private CacheCleanupStrategy cacheCleanupStrategy = CacheCleanupStrategy.NO_CLEANUP;
    private LockOptions lockOptions = mode(FileLockManager.LockMode.Shared);
    private String displayName;

    public DefaultCacheBuilder(CacheFactory factory, File baseDir) {
        this.factory = factory;
        this.baseDir = baseDir;
    }

    @Override

 */
package org.gradle.cache.internal

import org.gradle.cache.FileAccess
import org.gradle.cache.FileLock
import org.gradle.cache.FileLockManager
import org.gradle.cache.FileLockManager.LockMode
import org.gradle.test.fixtures.file.TestNameTestDirectoryProvider
import org.junit.Rule
import spock.lang.Specification

import java.util.function.Supplier

    /**
     * These modes can be used either with {@link FileLockManager} or when creating {@link PersistentCache} via {@link CacheBuilder#withInitialLockMode(LockMode)}
     */
    enum LockMode {

        /**
         * On demand, single writer, no readers (on demand exclusive mode).
         * <br><br>
         *

import spock.lang.Specification

import java.util.function.Consumer

import static org.gradle.cache.CacheCleanupStrategy.NO_CLEANUP
import static org.gradle.cache.FileLockManager.LockMode.OnDemand
import static org.gradle.cache.FileLockManager.LockMode.Shared
import static org.gradle.cache.internal.filelock.DefaultLockOptions.mode

class DefaultCacheBuilderTest extends Specification {
    @Rule

     * @throws InsufficientLockModeException If the held lock is not at least a shared lock (e.g. LockMode.NONE)
     */
    <T> T readFile(Callable<? extends T> action) throws LockTimeoutException, FileIntegrityViolationException, InsufficientLockModeException;

    /**