initialize()
    return object : MutableIterator<Snapshot> {
      /** Iterate a copy of the entries to defend against concurrent modification errors. */
      private val delegate = ArrayList(lruEntries.values).iterator()

      /** The snapshot to return from [next]. Null if we haven't computed that yet. */
      private var nextSnapshot: Snapshot? = null

}
```

### 10.2 Batch Handle Operations
```java
public class BatchHandleOperations {
    public void reconnectMultipleHandles(List<HandleInfo> handles) {
        List<CompletableFuture<Void>> futures = new ArrayList<>();
        
        for (HandleInfo handle : handles) {
            futures.add(CompletableFuture.runAsync(() -> {
                try {
                    reconnectHandle(handle);

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.cbean.cq.bs;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;

import org.codelibs.fess.opensearch.config.allcommon.EsAbstractConditionQuery;
import org.codelibs.fess.opensearch.config.cbean.cq.AccessTokenCQ;
import org.dbflute.cbean.ckey.ConditionKey;

      if (length == -1) return emptyList() // OkHttp v1.2 used -1 to indicate null.

      try {
        val certificateFactory = CertificateFactory.getInstance("X.509")
        val result = ArrayList<Certificate>(length)
        for (i in 0 until length) {
          val line = source.readUtf8LineStrict()
          val bytes = Buffer()

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.cbean.cq.bs;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;

import org.codelibs.fess.opensearch.config.allcommon.EsAbstractConditionQuery;
import org.codelibs.fess.opensearch.config.cbean.cq.LabelTypeCQ;
import org.dbflute.cbean.ckey.ConditionKey;

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.cbean.cq.bs;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;

import org.codelibs.fess.opensearch.config.allcommon.EsAbstractConditionQuery;
import org.codelibs.fess.opensearch.config.cbean.cq.FileAuthenticationCQ;

    return castOrCopyToCollection(iterable).toArray();
  }

  /**
   * Converts an iterable into a collection. If the iterable is already a collection, it is
   * returned. Otherwise, an {@link java.util.ArrayList} is created with the contents of the
   * iterable in the same iteration order.
   */
  private static <E extends @Nullable Object> Collection<E> castOrCopyToCollection(
      Iterable<E> iterable) {

    // Enqueue an additional response that show if we burnt a good prior response.
    server.enqueue(
      MockResponse(body = "XXX"),
    )
    val connections: MutableList<RealConnection?> = ArrayList()
    val localClient =
      client
        .newBuilder()
        .eventListener(
          object : EventListener() {
            override fun connectionAcquired(
              call: Call,

    assertThat(server2.takeRequest().exchangeIndex, "Expected connection reuse")
      .isEqualTo(1)
  }

  @Test
  fun redirectWithProxySelector() {
    val proxySelectionRequests: MutableList<URI> = ArrayList()
    client =
      client
        .newBuilder()
        .proxySelector(
          object : ProxySelector() {
            override fun select(uri: URI): List<Proxy> {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.cbean.cq.bs;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;

import org.codelibs.fess.opensearch.config.allcommon.EsAbstractConditionQuery;
import org.codelibs.fess.opensearch.config.cbean.cq.DataConfigCQ;
import org.dbflute.cbean.ckey.ConditionKey;