@ElementTypesAreNonnullByDefault
// Some Android 5.0.x Samsung devices have bugs in JDK reflection APIs that cause
// getDeclaredField to throw a NoSuchFieldException when the field is definitely there.
// Since this class only needs CAS on one field, we can avoid this bug by extending AtomicReference
// instead of using an AtomicReferenceFieldUpdater. This reference stores Thread instances
// and DONE/INTERRUPTED - they have a common ancestor of Runnable.

# Request Body

When you need to send data from a client (let's say, a browser) to your API, you send it as a **request body**.

A **request** body is data sent by the client to your API. A **response** body is the data your API sends to the client.

Your API almost always has to send a **response** body. But clients don't necessarily need to send **request bodies** all the time, sometimes they only request a path, maybe with some query parameters, but don't send a body.

	disks := er.getDisks()
	// Assume (N/2 + 1) quorum for Delete()
	// this is a theoretical assumption such that
	// for delete's we do not need to honor storage
	// class for objects that have reduced quorum
	// due to storage class - this only needs to be honored
	// for Read() requests alone that we already do.
	writeQuorum := len(disks)/2 + 1

	g := errgroup.WithNErrs(len(disks))

         * that chained message. Before doing so we must increment
         * the batchLevel of the andx message in case it itself is an
         * andx message and needs to perform the same check as above.
         */

        andx.batchLevel = batchLevel + 1;


        dst[start + ANDX_COMMAND_OFFSET] = andxCommand;
        dst[start + ANDX_RESERVED_OFFSET] = (byte)0x00;

```

> The admin user running this command needs the "admin:SetTier" and "admin:ListTier" permissions if not running as root.

Using above tier, set up a lifecycle rule with transition:

```

Continuing with the previous example, it will be common to have more than one related model.

This is especially the case for user models, because:

* The **input model** needs to be able to have a password.
* The **output model** should not have a password.
* The **database model** would probably need to have a hashed password.

/// danger

Never store user's plaintext passwords. Always store a "secure hash" that you can then verify.

    // ------------------------------------------------------------------------

    public boolean hasVersionRangeViolations() {
        return versionRangeViolations != null;
    }

    /**
     * TODO this needs to accept a {@link OverConstrainedVersionException} as returned by
     *       {@link #getVersionRangeViolation(int)} but it's not used like that in
     *       DefaultLegacyArtifactCollector
     *

For this, use the Python standard module <a href="https://docs.python.org/3/library/secrets.html" class="external-link" target="_blank">`secrets`</a> to check the username and password.

`secrets.compare_digest()` needs to take `bytes` or a `str` that only contains ASCII characters (the ones in English), this means it wouldn't work with characters like `á`, as in `Sebastián`.

-----------------

The equivalent of static methods in Java is companion object functions in Kotlin. The bytecode is
the same but `.kt` files now need `Companion` in the import.

This works with OkHttp 3.x:

```kotlin
import okhttp3.CipherSuite.forJavaName
```

But OkHttp 4.x needs a `Companion`:

```kotlin
import okhttp3.CipherSuite.Companion.forJavaName
```

            fireEvent(ResolutionListener.MANAGE_ARTIFACT_SYSTEM_PATH, listeners, node, artifact);
            node.getArtifact().setFile(artifact.getFile());
        }
    }

    /**
     * Check if the artifactScope needs to be updated. <a
     * href="http://docs.codehaus.org/x/IGU#DependencyMediationandConflictResolution-Scoperesolution">More info</a>.
     *
     * @param farthest farthest resolution node