This can be very useful for setting up **resources** that you need to use for the whole app, and that are **shared** among requests, and/or that you need to **clean up** afterwards. For example, a database connection pool, or loading a shared machine learning model.

## Use Case { #use-case }

Let's start with an example **use case** and then see how to solve it with this.

### Remotely Inspecting backend data

                if (offerBasic) {
                    response.addHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
                }
                response.setHeader("Connection", "close");
                response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                response.flushBuffer();
                return;
            }

```java
// In SmbFile.java
private Smb2LeaseKey leaseKey;
private int leaseState;
private LeaseManager leaseManager;

protected void doConnect() throws IOException {
    // ... existing connection logic ...
    
    if (context.getConfig().isUseLeases() && tree.getSession().supports(SMB3_0)) {
        // Request lease when opening file
        leaseManager = tree.getSession().getLeaseManager();

        <otherArchive>http://maven.notifications.markmail.org/</otherArchive>
      </otherArchives>
    </mailingList>
  </mailingLists>
  <scm>
    <connection>scm:svn:http://svn.apache.org/repos/asf/maven/components/trunk</connection>
    <developerConnection>scm:svn:https://svn.apache.org/repos/asf/maven/components/trunk</developerConnection>
    <url>http://svn.apache.org/viewcvs.cgi/maven/components/trunk</url>

        dstIndex += this.scope.length();

        dst[dstIndex++] = (byte) 0x00;

        // now go over scope backwards converting '.' to label length

        int i = dstIndex - 2;
        final int e = i - this.scope.length();
        int c = 0;

        do {
            if (dst[i] == '.') {
                dst[i] = (byte) c;

    private FileEntry next;
    private int ridx;

    private boolean closed = false;

    /**
     * Creates a directory entry enumeration iterator.
     *
     * @param th the SMB tree handle for the connection
     * @param parent the parent resource being enumerated
     * @param wildcard the wildcard pattern for filtering entries
     * @param filter additional resource name filter to apply

Now, the STS certificate-based authentication happens in 4 steps:

- Client sends HTTP `POST` request over a TLS connection hitting the MinIO TLS STS API.
- MinIO verifies that the client certificate is valid.
- MinIO tries to find a policy that matches the `CN` of the client certificate.

        /**
         * The share permissions.
         */
        public int permissions;
        /**
         * The maximum number of concurrent connections.
         */
        public int max_uses;
        /**
         * The current number of connections.
         */
        public int current_uses;
        /**
         * The local path of the share.
         */
        public String path;

  </developers>
  <modules>
    <module>guava</module>
    <module>guava-bom</module>
    <module>guava-testlib</module>
    <module>guava-tests</module>
  </modules>
  <scm>
    <connection>scm:git:https://github.com/google/guava.git</connection>
    <developerConnection>scm:git:******@****.***:google/guava.git</developerConnection>
    <url>https://github.com/google/guava</url>
  </scm>
  <issueManagement>