package org.apache.http.pool;

import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.util.Args;
import java.util.concurrent.TimeUnit;

@Contract(
   threading = ThreadingBehavior.SAFE_CONDITIONAL
)
public abstract class PoolEntry<T, C> {
   private final String id;
   private final T route;
   private final C conn;
   private final long created;
   private final long validityDeadline;
   private long updated;
   private long expiry;
   private volatile Object state;

   public PoolEntry(String id, T route, C conn, long timeToLive, TimeUnit timeUnit) {
      Args.notNull(route, "Route");
      Args.notNull(conn, "Connection");
      Args.notNull(timeUnit, "Time unit");
      this.id = id;
      this.route = route;
      this.conn = conn;
      this.created = System.currentTimeMillis();
      this.updated = this.created;
      if (timeToLive > 0L) {
         long deadline = this.created + timeUnit.toMillis(timeToLive);
         this.validityDeadline = deadline > 0L ? deadline : Long.MAX_VALUE;
      } else {
         this.validityDeadline = Long.MAX_VALUE;
      }

      this.expiry = this.validityDeadline;
   }

   public PoolEntry(String id, T route, C conn) {
      this(id, route, conn, 0L, TimeUnit.MILLISECONDS);
   }

   public String getId() {
      return this.id;
   }

   public T getRoute() {
      return this.route;
   }

   public C getConnection() {
      return this.conn;
   }

   public long getCreated() {
      return this.created;
   }

   public long getValidityDeadline() {
      return this.validityDeadline;
   }

   /** @deprecated */
   @Deprecated
   public long getValidUnit() {
      return this.validityDeadline;
   }

   public Object getState() {
      return this.state;
   }

   public void setState(Object state) {
      this.state = state;
   }

   public synchronized long getUpdated() {
      return this.updated;
   }

   public synchronized long getExpiry() {
      return this.expiry;
   }

   public synchronized void updateExpiry(long time, TimeUnit timeUnit) {
      Args.notNull(timeUnit, "Time unit");
      this.updated = System.currentTimeMillis();
      long newExpiry;
      if (time > 0L) {
         newExpiry = this.updated + timeUnit.toMillis(time);
      } else {
         newExpiry = Long.MAX_VALUE;
      }

      this.expiry = Math.min(newExpiry, this.validityDeadline);
   }

   public synchronized boolean isExpired(long now) {
      return now >= this.expiry;
   }

   public abstract void close();

   public abstract boolean isClosed();

   public String toString() {
      StringBuilder buffer = new StringBuilder();
      buffer.append("[id:");
      buffer.append(this.id);
      buffer.append("][route:");
      buffer.append(this.route);
      buffer.append("][state:");
      buffer.append(this.state);
      buffer.append("]");
      return buffer.toString();
   }
}
