require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int =
    connections.count {
      it.withLock { it.calls.isEmpty() }
    }

  fun connectionCount(): Int = connections.size

  /**
   * Attempts to acquire a recycled connection to [address] for [call]. Returns the connection if it

    var connectionPool = ConnectionPool()
    connectionPool = ConnectionPool(0, 0L, TimeUnit.SECONDS)
    val idleConnectionCount: Int = connectionPool.idleConnectionCount()
    val connectionCount: Int = connectionPool.connectionCount()
    connectionPool.evictAll()
  }

  @Test
  fun connectionSpec() {
    var connectionSpec: ConnectionSpec = ConnectionSpec.RESTRICTED_TLS
    connectionSpec = ConnectionSpec.MODERN_TLS

    client.newCall(request).execute().use { response ->
      assertEquals(200, response.code)
    }

    client.connectionPool.evictAll()
    assertEquals(0, client.connectionPool.connectionCount())

    client.newCall(request).execute().use { response ->
      assertEquals(200, response.code)
    }

    assertEquals(2, sessionIds.size)
    assertEquals(sessionIds[0], sessionIds[1])
  }

    val call1 = client.newCall(Request(server.url("/")))
    val response = call1.execute()
    call1.cancel()

    // That connection is pooled, and it works.
    assertThat(client.connectionPool.connectionCount()).isEqualTo(1)
    val call2 = client.newCall(Request(server.url("/")))
    val response2 = call2.execute()
    assertThat(response2.body.string()).isEqualTo("def")

	public abstract fun socket ()Ljava/net/Socket;
}

public final class okhttp3/ConnectionPool {
	public fun <init> ()V
	public fun <init> (IJLjava/util/concurrent/TimeUnit;)V
	public final fun connectionCount ()I
	public final fun evictAll ()V
	public final fun idleConnectionCount ()I
}

public final class okhttp3/ConnectionSpec {
	public static final field CLEARTEXT Lokhttp3/ConnectionSpec;

	public abstract fun socket ()Ljava/net/Socket;
}

public final class okhttp3/ConnectionPool {
	public fun <init> ()V
	public fun <init> (IJLjava/util/concurrent/TimeUnit;)V
	public final fun connectionCount ()I
	public final fun evictAll ()V
	public final fun idleConnectionCount ()I
}

public final class okhttp3/ConnectionSpec {
	public static final field CLEARTEXT Lokhttp3/ConnectionSpec;