Added ps() API

Signed-off-by: Amith Koujalgi <koujalgi.amith@gmail.com>

docs/docs/apis-extras/ps.md

@@ -0,0 +1,30 @@
+---
+sidebar_position: 4
+---
+
+# PS
+
+This API provides a list of running models and details about each model currently loaded into memory.
+
+This API corresponds to the [PS](https://github.com/ollama/ollama/blob/main/docs/api.md#list-running-models) API.
+
+```java
+package io.github.ollama4j.localtests;
+
+import io.github.ollama4j.OllamaAPI;
+import io.github.ollama4j.exceptions.OllamaBaseException;
+import io.github.ollama4j.models.ps.ModelsProcessResponse;
+
+import java.io.IOException;
+
+public class Main {
+    public static void main(String[] args) {
+
+        OllamaAPI ollamaAPI = new OllamaAPI("http://localhost:11434");
+
+        ModelsProcessResponse response = ollamaAPI.ps();
+
+        System.out.println(response);
+    }
+}
+```

src/main/java/io/github/ollama4j/OllamaAPI.java

@@ -1,5 +1,6 @@
 package io.github.ollama4j;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import io.github.ollama4j.exceptions.OllamaBaseException;
 import io.github.ollama4j.exceptions.ToolInvocationException;
 import io.github.ollama4j.exceptions.ToolNotFoundException;
@@ -12,6 +13,7 @@ import io.github.ollama4j.models.embeddings.OllamaEmbeddingResponseModel;
 import io.github.ollama4j.models.embeddings.OllamaEmbeddingsRequestModel;
 import io.github.ollama4j.models.generate.OllamaGenerateRequestModel;
 import io.github.ollama4j.models.generate.OllamaStreamHandler;
+import io.github.ollama4j.models.ps.ModelsProcessResponse;
 import io.github.ollama4j.models.request.*;
 import io.github.ollama4j.tools.*;
 import io.github.ollama4j.utils.Options;
@@ -110,6 +112,37 @@ public class OllamaAPI {
         return statusCode == 200;
     }
 
+    /**
+     * List models that are currently loaded into memory.
+     *
+     * @return ModelsProcessResponse
+     */
+    public ModelsProcessResponse ps() throws IOException, InterruptedException, OllamaBaseException {
+        String url = this.host + "/api/ps";
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest httpRequest = null;
+        try {
+            httpRequest =
+                    getRequestBuilderDefault(new URI(url))
+                            .header("Accept", "application/json")
+                            .header("Content-type", "application/json")
+                            .GET()
+                            .build();
+        } catch (URISyntaxException e) {
+            throw new RuntimeException(e);
+        }
+        HttpResponse<String> response = null;
+        response = httpClient.send(httpRequest, HttpResponse.BodyHandlers.ofString());
+        int statusCode = response.statusCode();
+        String responseString = response.body();
+        if (statusCode == 200) {
+            return Utils.getObjectMapper()
+                    .readValue(responseString, ModelsProcessResponse.class);
+        } else {
+            throw new OllamaBaseException(statusCode + " - " + responseString);
+        }
+    }
+
     /**
      * List available models from Ollama server.
      *

src/main/java/io/github/ollama4j/models/ps/ModelsProcessResponse.java

@@ -0,0 +1,35 @@
+package io.github.ollama4j.models.ps;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+public class ModelsProcessResponse {
+    private List<ModelProcess> models;
+
+    @Data
+    @NoArgsConstructor
+    public static class ModelProcess {
+        private String name;
+        private String model;
+        private long size;
+        private String digest;
+        private ModelDetails details;
+        private String expiresAt;
+        private long sizeVram;
+    }
+
+    @Data
+    @NoArgsConstructor
+    public static class ModelDetails {
+        private String parentModel;
+        private String format;
+        private String family;
+        private List<String> families;
+        private String parameterSize;
+        private String quantizationLevel;
+    }
+}