}
                }
                commandLineBuilder.addOption(option);
            }
            for (String arg : commandLine.getArgList()) {
                commandLineBuilder.addArg(interpolator.interpolate(arg, callback));
            }
            return copy(source, cliManager, commandLineBuilder.get());
        } catch (InterpolatorException e) {

        Address addr1 = mock(Address.class);
        when(addr1.getHostAddress()).thenReturn("10.0.0.1");

        Address addr2 = mock(Address.class);
        when(addr2.getHostAddress()).thenReturn("10.0.0.2");

        when(nameSvc.getAllByName(eq("test.server"), eq(true))).thenReturn(new Address[] { addr1, addr2 });

        // Set fail counts (addr1 has more failures, addr2 has fewer)

        try {
            final NbtAddress[] addrs = getNodeStatus(addr);
            cacheAddressArray(addrs);
            return addrs;
        } catch (final UnknownHostException uhe) {
            throw new UnknownHostException("no name with type 0x" + Hexdump.toHexString(addr.getNameType(), 2)

        Object addr;
        int i;

        if (hostname == null || hostname.length() == 0) {
            throw new UnknownHostException();
        }

        if (isDotQuadIP(hostname)) {
            final UniAddress[] addrs = new UniAddress[1];
            addrs[0] = new UniAddress(NbtAddress.getByName(hostname));
            return addrs;
        }

        } else if (calledName == SMBSERVER_NAME) {
            NbtAddress[] addrs;

            try {
                addrs = CLIENT.getNodeStatus(this);
                if (hostName.hexCode == 0x1D) {
                    for (final NbtAddress addr : addrs) {
                        if (addr.hostName.hexCode == 0x20) {
                            return addr.hostName.name;
                        }
                    }

            NetbiosAddress[] addrs;

            try {
                addrs = tc.getNameServiceClient().getNodeStatus(this);
                if (this.getNameType() == 0x1D) {
                    for (final NetbiosAddress addr : addrs) {
                        if (addr.getNameType() == 0x20) {
                            return addr.getHostName();
                        }
                    }

            final boolean forceSigning) throws IOException {

        final Address[] addrs = tf.getNameServiceClient().getAllByName(name, true);

        if (addrs == null || addrs.length == 0) {
            throw new UnknownHostException(name);
        }

        Arrays.sort(addrs, (o1, o2) -> {
            Integer fail1 = SmbTransportPoolImpl.this.failCounts.get(o1.getHostAddress());

---

## Key Components

### Crawler (`Crawler.java`)

Main orchestrator for crawling operations.

**Key Methods**:
```java
String execute()                // Start crawling, return session ID
void addUrl(String url)         // Add URL to queue
void cleanup(String sessionId)  // Clean up session
void stop()                     // Stop gracefully
```

```java
// Create multiple crawler instances
Crawler crawler1 = container.getComponent("crawler");
crawler1.setSessionId("session1");
crawler1.addUrl("https://site1.com");

Crawler crawler2 = container.getComponent("crawler");  
crawler2.setSessionId("session2");
crawler2.addUrl("https://site2.com");

// Execute concurrently
crawler1.setBackground(true);
crawler2.setBackground(true);

import org.codelibs.fess.crawler.service.UrlQueueService;

import jakarta.annotation.Resource;

/**
 * The Crawler class is the main class for web crawling. It manages the crawling process,
 * including adding URLs to the queue, filtering URLs, managing crawler threads,
 * and handling the overall crawling lifecycle.
 *
 * <p>It implements the Runnable interface to be executed in a separate thread,