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author | Jon Bratseth <bratseth@yahoo-inc.com> | 2016-06-15 23:09:44 +0200 |
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committer | Jon Bratseth <bratseth@yahoo-inc.com> | 2016-06-15 23:09:44 +0200 |
commit | 72231250ed81e10d66bfe70701e64fa5fe50f712 (patch) | |
tree | 2728bba1131a6f6e5bdf95afec7d7ff9358dac50 /jdisc_core/src/main/java/com/yahoo/jdisc/References.java |
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Diffstat (limited to 'jdisc_core/src/main/java/com/yahoo/jdisc/References.java')
-rw-r--r-- | jdisc_core/src/main/java/com/yahoo/jdisc/References.java | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/jdisc_core/src/main/java/com/yahoo/jdisc/References.java b/jdisc_core/src/main/java/com/yahoo/jdisc/References.java new file mode 100644 index 00000000000..868ae6ac720 --- /dev/null +++ b/jdisc_core/src/main/java/com/yahoo/jdisc/References.java @@ -0,0 +1,47 @@ +// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. +package com.yahoo.jdisc; + +/** + * Utility class for working with {@link SharedResource}s and {@link ResourceReference}s. + * + * @author <a href="mailto:bakksjo@yahoo-inc.com">Oyvind Bakksjo</a> + */ +public class References { + // Prevents instantiation. + private References() { + } + + /** + * A {@link ResourceReference} that does nothing. + * Useful for e.g. testing of resource types when reference counting is not the focus. + */ + public static final ResourceReference NOOP_REFERENCE = new ResourceReference() { + @Override + public void close() { + } + }; + + /** + * <p>Returns a {@link ResourceReference} that invokes {@link SharedResource#release()} on + * {@link ResourceReference#close() close}. Useful for treating the "main" reference of a {@link SharedResource} + * just as any other reference obtained by calling {@link SharedResource#refer()}. Example:</p> + * <pre> + * final Request request = new Request(...); + * try (final ResourceReference ref = References.fromResource(request)) { + * .... + * } + * // The request will be released on exit from the try block. + * </pre> + * + * @param resource The resource to create a ResourceReference for. + * @return a ResourceReference whose close() method will call release() on the given resource. + */ + public static ResourceReference fromResource(final SharedResource resource) { + return new ResourceReference() { + @Override + public void close() { + resource.release(); + } + }; + } +} |