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# Connection Management
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Connection pooling, SSL/TLS configuration, and connection specifications for performance optimization.
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## Capabilities
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### ConnectionPool
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Manages HTTP/HTTPS connection reuse to reduce latency and resource usage.
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```java { .api }
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public final class ConnectionPool {
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    public ConnectionPool(int maxIdleConnections, long keepAliveDurationMs);
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    public ConnectionPool(int maxIdleConnections, long keepAliveDuration, TimeUnit timeUnit);
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    public static ConnectionPool getDefault();
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    public int getIdleConnectionCount();
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    public int getConnectionCount();
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    public int getSpdyConnectionCount();
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    public int getMultiplexedConnectionCount();
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    public int getHttpConnectionCount();
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    public void evictAll();
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}
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```
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### ConnectionSpec
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Configuration for socket connections including TLS versions and cipher suites.
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```java { .api }
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public final class ConnectionSpec {
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    public static final ConnectionSpec MODERN_TLS;
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    public static final ConnectionSpec COMPATIBLE_TLS;
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    public static final ConnectionSpec CLEARTEXT;
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    public boolean isTls();
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    public List<CipherSuite> cipherSuites();
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    public List<TlsVersion> tlsVersions();
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    public boolean supportsTlsExtensions();
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    public boolean isCompatible(SSLSocket socket);
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}
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```
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### Dispatcher
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Policy for executing asynchronous requests with thread pool management.
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```java { .api }
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public final class Dispatcher {
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    public Dispatcher();
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    public Dispatcher(ExecutorService executorService);
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    public ExecutorService getExecutorService();
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    public void setMaxRequests(int maxRequests);
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    public int getMaxRequests();
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    public void setMaxRequestsPerHost(int maxRequestsPerHost);
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    public int getMaxRequestsPerHost();
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    public void cancel(Object tag);
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    public int getRunningCallCount();
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    public int getQueuedCallCount();
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}
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```
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**Usage Examples:**
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```java
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// Custom connection pool
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ConnectionPool pool = new ConnectionPool(10, 5, TimeUnit.MINUTES);
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client.setConnectionPool(pool);
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// Modern TLS only
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List<ConnectionSpec> specs = Arrays.asList(
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    ConnectionSpec.MODERN_TLS,
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    ConnectionSpec.CLEARTEXT
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);
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client.setConnectionSpecs(specs);
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// Custom dispatcher limits
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Dispatcher dispatcher = new Dispatcher();
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dispatcher.setMaxRequests(100);
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dispatcher.setMaxRequestsPerHost(10);
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client.setDispatcher(dispatcher);
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```